SABIIA - Sistema Aberto e Integrado de Informação em Agricultura (Sabiia)

De Groote, Hugo; Owuor, George; Doss, Cheryl R.; Ouma, James Okuro; Muhammad, Lutta; Danda, Milton Kengo.

The maize green revolution, which increased maize yields through the use of improved varieties and fertilizer, has stalled since the mid-eighties in Kenya. This paper examines whether the stagnation of yields continued in the 1990s in spite of the implementation of the maize liberalization policies by the Kenya Government. Analysis of farm level surveys from 1992 and 2002 indicates slight increases in the use of improved maize varieties and fertilizer, but a substantial decrease in the intensity of fertilizer use. The econometric analysis suggests that the intensity of fertilizer use has a major effect on yield. The use of improved maize varieties, however, did not affect yield, suggesting that there are local varieties for some areas that do as well as...

Tipo: Journal Article

Palavras-chave: Green revolution; Maize; Adoption; Soil fertility; Kenya; Crop Production/Industries; International Development.

Ano: 2005

URL: http://purl.umn.edu/110143

ON ECONOMIC-MATHEMATICAL MODEL FOR TECHNOLOGY OF DIFFERENTIATED APPLICATION OF FERTILIZERS

Litchman, Gennadiy; Nukeshev, Sayahat.

The paper studies agricultural crops’ yield depending on quality of entering of mineral fertilizers. It is established that determining average productivity, under square-law dependence of yield on a dose, there is not necessity to set the law of fertilizers distribution across the field and will be sufficient to know expected value D and standard deviation sD. The paper considers approaches to economic-mathematical model of optimization of fertilizers’ doses at the differentiated entering. The produced result provides a new approach to the quality control in technological process of fertilizers application. Also, it allows formulating requirements to perspective technical means used for entering of mineral fertilizers.

Tipo: Journal Article

Palavras-chave: Soil fertility; Mineral fertilizers; Crop yield; Response function; Agribusiness.

Ano: 2009

URL: http://purl.umn.edu/94557

ECOLOGICAL MICROBIOFERTILIZER OF MERS SERIES

Usmanov, Sultan; Imanbekov, Kylichbek; Mahmudov, Ravshan.

The soil microorganisms provide essential influence on sustaining soil fertility and high crop yield. Therefore, regulation of microorganisms’ life processes plays the most important role in agrobiotechnologies. The paper describes plant and soil efficiency of MERS microbiofertilizer.

Tipo: Journal Article

Palavras-chave: Microbiofertilizer; Soil microorganisms; Soil fertility; Agribusiness; Agricultural and Food Policy; Agricultural Finance.

Ano: 2009

URL: http://purl.umn.edu/94556

“Bright spots” in Uzbekistan, reversing land and water degradation while improving livelihoods: Key developments and sustaining ingredients for transition economies of the former Soviet Union

Noble, Andrew D.; Ul Hassan, Mehmood; Kazbekov, Jusipbek.

Following the dissolution of the former Soviet Union and the collapse of existing trade arrangements, the newly independent states of Central Asia were left with the task of developing their own independent market economies. The region has undergone tremendous economic and social changes including significant agricultural reform mainly targeted at privatizing large collective farms that were established during the Soviet era. These reforms include the establishment of smaller private and cooperative farms in order to improve the efficiency and equity of existing production systems. Within Uzbekistan, this move to privatize farms has, in the majority of cases, led to declining productivity and net incomes. However, there have been instances where privatized...

Tipo: Report

Palavras-chave: Irrigated farming; Water quality; Drainage; Soil fertility; Crop yield; Investment; Agribusiness; Crop Production/Industries; Financial Economics; Land Economics/Use.

Ano: 2005

URL: http://purl.umn.edu/44541

Socio-economic Factors Influencing Adoption of Fertilizer for Maize Production in Nepal: A Cast Study of Chitwan District

Paudel, Pashupati; Shrestha, Arjun Kumar; Matsuoka, Atsushi.

Soil fertility is considered as the most important constraint to increase maize production in Nepal. Although farmers generally apply farmyard manure available on their farms, there is increasing trend towards the use of fertilizers that is likely to augment maize production in Nepal. This study was carried out to identify the influence of socio-economic factors of the improved maize adopters on the decision to adopt fertilizers in the Chitwan district of Nepal, using the survey data collected from 117 farm households in May-June 2005. The impact of age, education, family size, farm size, extension service, credit use, manure application, off-farm income and timely irrigation availability on the adoption of fertilizers were analyzed using the Tobit...

Tipo: Conference Paper or Presentation

Palavras-chave: Maize; Soil fertility; Food security; Tobit model; International Development.

Ano: 2009

URL: http://purl.umn.edu/51066

Economic Evaluation of Rice-Prawn Gher Farming System on Soil Fertility for Modern Variety (MV) Paddy Production in Bangladesh

Barmon, Basanta Kumar; Osanami, Fumio; Kondo, Takumi.

This present study attempts to examine the economic evaluation of rice-prawn gher farming system on land fertility for modern variety (MV) paddy production in Bangladesh. Laboratory based experimental data and field survey data were used in the present study. To test the change of land fertility, soils were collected before paddy production (after prawn production) and after paddy production (before prawn production) and tested in the Soil Resource Development Institute (SRDI) laboratory in Khulna, Bangladesh. The findings of the study indicate that the farmer applied comparatively less chemical fertilizers in MV paddy production under the rice-prawn gher farming system compared to MV paddy production. The input cost of chemical fertilizers for MV paddy...

Tipo: Conference Paper or Presentation

Palavras-chave: Rice-prawn gher farming system; Soil fertility; MV paddy production; Food Consumption/Nutrition/Food Safety; Livestock Production/Industries; O13; Q55.

Ano: 2006

URL: http://purl.umn.edu/25355

Economic gains of improving soil fertility and water holding capacity with clay application: the impact of soil remediation research in northeast Thailand

Saleth, Rathinasamy Maria; Inocencio, Arlene; Noble, Andrew D.; Ruaysoongnern, Sawaeng.

Declining productivity of agricultural soils in Northeast Thailand is a challenge facing land managers and farmers. A program was initiated in 2002 to investigate the potential role of incorporating clay-based materials into degraded soils as a means of enhancing productivity. This research report attempts to provide an ex-post assessment of the field level impact and economic viability of this approach, using the empirically derived estimates of the average income impacts that the application of bentonite or clay technology has generated among farm communities in Northeast Thailand. From an exclusive IWMI perspective, the impact evaluation suggests that the program has a net present value (NPV) of US$0.41 million with a benefit-cost ratio (BCR) of 2.44...

Tipo: Report

Palavras-chave: Soil improvement; Impact assessment; Research projects; Soil fertility; Sandy soils; Water holding capacity; Clay soils; Soil water relations; Soil management; Farming systems; Crop yield; Vegetable crops; Rice; Sorghum; Models; Statistical methods; Cost benefit analysis; Economic analysis; Economic aspects; Thailand; Agribusiness; Agricultural Finance; Crop Production/Industries; Environmental Economics and Policy; Farm Management; Land Economics/Use; Production Economics; Productivity Analysis; Research and Development/Tech Change/Emerging Technologies; Research Methods/ Statistical Methods.

Ano: 2009

URL: http://purl.umn.edu/53064

THE EMERGENCE AND SPREADING OF AN IMPROVED TRADITIONAL SOIL AND WATER CONSERVATION PRACTICE IN BURKINA FASO

Kabore, Daniel; Reij, Chris.

This paper describes the emergence of improved traditional planting pits (zaï) in Burkina Faso in the early 1980s as well as their advantages, disadvantages and impact. The zaï emerged in a context of recurrent droughts and frequent harvest failures, which triggered farmers to start improving this local practice. Despair triggered experimentation and innovation by farmers. These processes were supported and complemented by external intervention. Between 1985 and 2000 substantial public investment has taken place in soil and water conservation (SWC). The socio-economic and environmental situation on the northern part of the Central Plateau is still precarious for many farming families, but the predicted environmental collapse has not occurred and in many...

Tipo: Working or Discussion Paper

Palavras-chave: Soil fertility; Soil conservation; Water conservation; Resource /Energy Economics and Policy.

Ano: 2004

URL: http://purl.umn.edu/16087

Improved Fallows in Eastern Zambia: History, Farmer Practice and Impacts

Kwesiga, Freddie; Franzel, Steven Charles; Mafongoya, Paramu; Ajayi, Olu Clifford; Phiri, Donald; Katanga, Roza; Kuntashula, Elias; Place, Frank; Chirwa, Teddy.

The decline in soil fertility in smallholder systems is a major factor inhibiting equitable development in much of sub-Saharan Africa. Some areas fallow in order to strength soil fertility for later planting, but as populations increase, demand follows. and continuous cropping becomes the norm and there is a reduction in yields. This case study summarizes the development of improved tree fallows by researchers and farmers in eastern Zambia to help solve the problem of poor soil fertility. Many farmers are finding that by using improved fallows, they can substitute relatively small amounts of land and labor for cash, which they would need to buy mineral fertilizer. The study has three phases: the historical background (phase 1); an assessment of problems,...

Tipo: Working or Discussion Paper

Palavras-chave: Zambia; Fallows; Crop yields; Soil fertility; Crop Production/Industries.

Ano: 2005

URL: http://purl.umn.edu/59247

SPATIAL ANALYSIS OF SOIL FERTILITY MANAGEMENT USING INTEGRATED HOUSEHOLD AND GIS DATA FROM SMALLHOLDER KENYAN FARMS

Staal, Steven J.; Romney, D.; Baltenweck, Isabelle; Waithaka, Michael M.; Muriuki, H.; Njoroge, L..

Although soil fertility is recognized as a primary constraint to agricultural production in developing countries, use of fertilizer in Sub-Saharan Africa is declining. Smallholder farmers still rely heavily on livestock manure for soil fertility management. To explore the determinants of soil fertility management practices, including both the use of cattle manure and inorganic fertilizer, data are used from a sample of 3,330 geo-referenced farm households across Central and Western Kenya. A bivariate probit model is applied to jointly examine the use of the two technologies. Particular attention is given to measures of location related to market access and agroclimate, which in the adoption literature have typically been addressed using crude proxies....

Tipo: Conference Paper or Presentation

Palavras-chave: Spatial analysis; Soil fertility; Market access; Technology adoption.; Farm Management; Land Economics/Use; Q12; Q16.

Ano: 2003

URL: http://purl.umn.edu/25903

Potential acidity estimated by SMP pH in soils of the state of Pará

Gama,Marcos André Piedade; Matos,Gilson Sergio Bastos de; Silva,George Rodrigues da; Brasil,Edilson Carvalho; Nunes,Otiniel Ferreira.

The use of SMP pH to estimate the potential acidity (H + Al) is more practical than the method of 0.5 mol L-1 calcium acetate for routine laboratory analyses. The objective was to fit an equation to estimate the H + Al from SMP pH values of soils of the State of Pará. From various regions of the state, 177 soil samples were collected, in which the SMP pH was determined in 0.01 mol L-1 CaCl2 solution and H + Al in 0.5 mol L-1 calcium acetate and the results were related by regression analysis. The equation H + Al = 77.77 + 20.61 SMP pH - 1.435 SMP pH² (R² = 0.90) expressed the H + Al values (in cmol c dm-3) best. When the SMP pH values were used in equations referring to other regions or states in Brazil, the H +Al values were over- or underestimated. The...

Physical, Chemical, and Microbiological Properties of Soil under Different Plant Covers in the Seridó Desertification Region in the Brazilian Semiarid

Palavras-chave: H + Al; Soil analysis; Amazon; Soil fertility.

Ano: 2013

URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832013000100020

Martins,Adriana Ferreira; Salcedo,Ignácio Hernan; Oliveira,Flávio Pereira de; Pereira,Walter Esfrain.

ABSTRACT The Seridó Desertification Region is a result of inadequate management of the native Caatinga vegetation, which generated degraded areas with little or no capacity for plant production. The area has experienced a succession of different land uses, but little is known about the impact of these changes. The present study tested the hypothesis that the intense degradation of the Caatinga drastically decreased vegetal biomass production, which favored direct soil exposure and resulted in a lower abundance and diversity of species and groups of vegetation as well as microorganisms. This study aimed to quantify some of the main physical, chemical, and microbiological properties of Alfisol ( Luvissolo Crômico órtico lítico ) and Entisol ( Neossolo...

Optical crop sensor for variable-rate nitrogen fertilization in corn: i - plant nutrition and dry matter production

Palavras-chave: Soil fertility; Soil structure; Soil microbial activity.

Ano: 2019

URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832019000100510

Bragagnolo,Jardes; Amado,Telmo Jorge Carneiro; Nicoloso,Rodrigo da Silveira; Jasper,Joerg; Kunz,Junior; Teixeira,Tiago de Gregori.

Variable-rate nitrogen fertilization (VRF) based on optical spectrometry sensors of crops is a technological innovation capable of improving the nutrient use efficiency (NUE) and mitigate environmental impacts. However, studies addressing fertilization based on crop sensors are still scarce in Brazilian agriculture. This study aims to evaluate the efficiency of an optical crop sensor to assess the nutritional status of corn and compare VRF with the standard strategy of traditional single-rate N fertilization (TSF) used by farmers. With this purpose, three experiments were conducted at different locations in Southern Brazil, in the growing seasons 2008/09 and 2010/11. The following crop properties were evaluated: above-ground dry matter production, nitrogen...

Efficiency of nitrogen fertilizer applied at corn sowing in contrasting growing seasons in Paraguay

Palavras-chave: Site-specific management; Optical spectrometry; Precision agriculture; Soil fertility.

Ano: 2013

URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832013000500018

Amado,Telmo Jorge Carneiro; Hahn Villalba,Enrique Oswin; Bortolotto,Rafael Pivotto; Santi,Antônio Luis; Benítez León,Enrique Asterio; Menefee,Dorothy; Kunz,Junior.

In order to select soil management practices that increase the nitrogen-use efficiency (NUE) in agro-ecosystems, the different indices of agronomic fertilizer efficiency must be evaluated under varied weather conditions. This study assessed the NUE indices in no-till corn in southern Paraguay. Nitrogen fertilizer rates from 0 to 180 kg ha-1 were applied in a single application at corn sowing and the crop response investigated in two growing seasons (2010 and 2011). The experimental design was a randomized block with three replications. Based on the data of grain yield, dry matter, and N uptake, the following fertilizer indices were assessed: agronomic N-use efficiency (ANE), apparent N recovery efficiency (NRE), N physiological efficiency (NPE), partial...

Assessing the Content of Micronutrients in Soils and Sugarcane in Different Pedogeological Contexts of Northeastern Brazil

Palavras-chave: Zea mays; Plant nutrition; No-tillage; Soil fertility.

Ano: 2013

URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832013000600020

Silva,Rita de Cássia Ferreira da; Silva,Fernando Bruno Vieira da; Biondi,Caroline Miranda; Nascimento,Clístenes Williams Araújo do; Oliveira,Emídio Cantídio Almeida de.

ABSTRACT Micronutrient research for sugarcane in northeastern Brazil is scarce and most works on this issue date back to the 70’s and 80’s. The objectives of this study were to assess the available and reserve pools of Fe, Mn, Cu, and Zn in soils cultivated with sugarcane under three geological contexts in northeastern Brazil as well as to diagnose the micronutrient nutritional status of sugarcane grown on these areas in order to identify pedogeological conditions in which micronutrient deficiencies are likely. Results showed that the soils cultivated with sugarcane in the states of Paraíba and Pernambuco posed available and reserve contents of micronutrients related to the parent materials and soil textural classes. The reserve contents of Fe, Mn, Zn, and...

Nutrient leaching potential following application of papermill lime-sludge to an acidic clay soil

Palavras-chave: Soil fertility; Trace elements; Plant nutrition; Critical levels.

Ano: 2019

URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832019000100522

Vettorazzo,S. C.; Amaral,F. C. S.; Chitolina,J. C..

This experiment was carried out under greenhouse conditions with soil pots during 210 days, to evaluate the effect of calcitic papermill lime-sludge application (at the rates 0, 773, 1.547, and 2.320 mg kg-1 or respective equivalents to control, 2, 4, and 6 t ha-1), on chemical composition of soil leachate and its effects on eucalypt growth and yield. Highest soil leachate pH, SO4, and Na concentrations occurred in the 4 and 6 t ha-1 treatments. Soil leachate nitrate concentrations decreased with increasing lime-sludge rate. Soil leachate phosphate remained low (below the detection limit) in all treatments until 120 days, while the concentration increased in the lime-sludge treatments at 210 days (last sampling) in about 600 mg L-1. Lime-sludge decreased...

Characterization of soil chemical properties of strawberry fields using principal component analysis

Palavras-chave: Eucalypt; Industrial residue; Soil fertility; Mineral nutrition; Sodium; Recycling.

Ano: 2001

URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832001000300025

Islabão,Gláucia Oliveira; Pinto,Marília Alves Brito; Selau,Lisiane Priscila Roldão; Vahl,Ledemar Carlos; Timm,Luís Carlos.

One of the largest strawberry-producing municipalities of Rio Grande do Sul (RS) is Turuçu, in the South of the State. The strawberry production system adopted by farmers is similar to that used in other regions in Brazil and in the world. The main difference is related to the soil management, which can change the soil chemical properties during the strawberry cycle. This study had the objective of assessing the spatial and temporal distribution of soil fertility parameters using principal component analysis (PCA). Soil sampling was based on topography, dividing the field in three thirds: upper, middle and lower. From each of these thirds, five soil samples were randomly collected in the 0-0.20 m layer, to form a composite sample for each third. Four...

Nitrogen fertilizer use efficiency, recovery and leaching of an alexandergrass pasture

Palavras-chave: Fragaria x ananassa Duch; Soil fertility; Multivariate analysis; Temporal variability.

Ano: 2013

URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832013000100017

Sartor,Laércio Ricardo; Assmann,Tangriani Simioni; Soares,André Brugnara; Adami,Paulo Fernando; Assmann,Alceu Luiz; Pitta,Christiano Santos Rocha.

Nitrogen usually determines the productive potential of forage crops, although it is highly unstable in the environment. Studies on recovery rates and use efficiency are important for more reliable fertilizer recommendations to reduce costs and avoid environmental pollution. The purpose of this study was to evaluate N use efficiency and recovery rate of Alexandergrass pasture (Brachiaria - Syn. Urochloa plantaginea) as well as N-NO3- and N-NH4+ soil concentrations using different levels of N fertilization under two grazing intensities. The experiment was arranged in a randomized block design in a factorial scheme with three replications. Treatments consisted of three N rates (0, 200 and 400 kg ha-1 N) and two grazing intensities termed low mass (LM; forage...

Influence of liming on residual soil respiration and chemical properties in a tropical no-tillage system

Palavras-chave: Forage production; Inorganic N; Soil fertility; Urea.

Ano: 2011

URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832011000300024

Marcelo,Adolfo Valente; Corá,José Eduardo; Scala Junior,Newton La.

Because of the climate changes occurring across the planet, especially global warming, the different forms of agricultural soil use have attracted researchers´ attention. Changes in soil management may influence soil respiration and, consequently, C sequestration. The objectives of this study were to evaluate the long-term influence of liming on soil respiration and correlate it with soil chemical properties after two years of liming in a no-tillage system. A randomized complete block design was used with six replications. The experimental treatments consisted of four lime rates and a control treatment without lime. Two years after liming, soil CO2 emission was measured and the soil sampled (layers 0-5, 5-10, 10-20, and 20-30 cm). The P, Ca2+ e Mg2+ soil...