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

Cai, Ruohong; Bergstrom, John C.; Mullen, Jeffrey D.; Wetzstein, Michael E..

This paper presents a dynamic crop rotation model that shows how crop yield and price volatility could impact crop mix and acreage response under crop rotation considerations. Specifically, a discrete Markov decision model is utilized to optimize producers’ crop rotation decision within a finite horizon. By maximizing net present value of expected current and future profits, a modified Bellman equation helps develop optimum planting decisions. This model is capable of simulating crop rotations with different lengths and structures. Specifically, the corn-soybeans rotations were simulated using the crop rotation model.

Tipo: Working or Discussion Paper

Palavras-chave: Crop rotation; Acreage response; Bellman equation; Crop Production/Industries; Research Methods/ Statistical Methods.

Ano: 2011

URL: http://purl.umn.edu/103949

Canola-Wheat Rotation versus Continuous Wheat for the Southern Plains

Duke, Jason C.; Epplin, Francis M.; Vitale, Jeffrey D.; Peeper, Thomas F..

Crop rotations are not common in the wheat belt of the Southern Plains. After years of continuous wheat, weeds have become increasingly difficult and expensive to manage. Yield data were elicited from farmers and used to determine if canola-wheat-wheat rotations are economically competitive with continuous wheat in the region.

THE INFLUENCES OF LAND TENANCY AND ROTATION SELECTION ON CRAWFISH FARMERS’ ADOPTION OF BEST MANAGEMENT PRACTICES

Palavras-chave: Crop rotation; Wheat; Canola; Elicited yield distributions; Crop Production/Industries; Farm Management; Q10; Q12.

Ano: 2009

URL: http://purl.umn.edu/46620

Nyaupane, Narayan P.; Gillespie, Jeffrey M..

This study investigates factors influencing the adoption of best management practices in Louisiana crawfish production. Probit results show acreage, years farming, portion of income from farming, technology adoption tendencies, hunting leases and a stream running through the farm to influence adoption. The most frequently used BMP was irrigation water management.

Assessing the Effects of Climate Change on Farm Production and Profitability: Dynamic Simulation Approach

Palavras-chave: Best Management Practices (BMPs); Technology adoption; Crawfish; Probit; Tenancy; Crop rotation; Production Economics.

Ano: 2008

URL: http://purl.umn.edu/46174

Cai, Ruohong; Bergstrom, John C.; Mullen, Jeffrey D.; Wetzstein, Michael E..

In this paper, a dynamic optimization model was developed to simulate how farm-level realized price and profitability respond to yield change which was induced by climate change. Producers' acreage response was included in the dynamic model considering crop rotation effect. In the crop rotation model, a modified Bellman equation was used to dynamically optimize the net present value of farm profit for a five-year interval. This simulation process was repeated through the year 2050. Then yield, price, and acreage response were compiled to generate realized profit. Results generally indicated that reduction in crop yields due to climate change results in reduced farm profitability for most of the states studied. Predicted climate change is more likely to...

The Dynamics of Farm Land Allocation - Short and Long Run Reactions in Long Micro Panel

Palavras-chave: Dynamic simulation model; Acreage response; Crop rotation; Expected price; Realized price; Agricultural Finance; Crop Production/Industries; Environmental Economics and Policy; Farm Management; Land Economics/Use; Production Economics; Productivity Analysis; Risk and Uncertainty.

Ano: 2011

URL: http://purl.umn.edu/103420

Arnberg, Soren; Hansen, Lars Garn.

This study develops a dynamic multi-output model of farmers crop allocation decisions that allows estimation of both short-run and long-run adjustments to a wide array of economic incentives. The method can be used to inform decision makers on a number of issues including agricultural policy reform and environmental regulation. The model allows estimation of dynamic effects relating to price expectations adjustment, investment lags, and crop rotation constraints. Estimation is based on micro-panel data from Danish farmers that includes acreage, output, and variable input utilization at the crop level. Results indicate that there are substantial differences between the short- and long-run land allocation behavior of Danish farmers and that there are...

A STOCHASTIC DOMINANCE ANALYSIS OF ALTERNATIVE SUGAR BEET- AND NAVY BEAN- BASED CROP ROTATIONS IN MICHIGAN

Palavras-chave: Land allocation; Crop rotation; System of dynamic equations; Micro panel data; GMM; Land Economics/Use; C33; Q12; Q15.

Ano: 2007

URL: http://purl.umn.edu/9978

Gebremedhin, Berhanu; Schwab, Gerald; Harwood, Richard R.; Christenson, Donald; Bricker, Calvin.

Sugar beets (Beta vulgaris L.) and navy beans (Phaseoulus vulgaris L.) have been important target crops in the crop rotation systems of many Michigan growers, particularly in the Saginaw Valley and the Thumb region. The recent decline in sugar beet yields combined with the erratic navy bean yields have led to concern about the optimal crop rotation for the East Central region in Michigan. Risk is an important consideration in a farmer's choice of cropping systems. This study uses 20 years of experimental data from the Michigan State University Saginaw Valley Research Farm to determine the risk efficiency of alternative sugar beet- and navy bean- based crop rotations that included corn (Zea mays L.), oats (Avena sativa L.), and alfalfa (Medicago sativa...

Tipo: Working or Discussion Paper

Palavras-chave: Crop rotation; Cropping system; Risk; Stochastic dominance analysis; First-degree stochastic dominance; Second-degree stochastic dominance.; Crop Production/Industries.

Ano: 1998

URL: http://purl.umn.edu/11509

The persistence of drought impacts across growing seasons: a dynamic stochastic analysis

Peck, Dannele E.; Adams, Richard M..

Agricultural producers throughout much of the United States experienced one of the most severe droughts in the last 100 years during the years 1999-2006. The prolonged nature of this drought highlights a need to better understand the impacts and management of drought across growing seasons, rather than just within a growing season. Producers express specific concern about the tendency of drought impacts to persist even after drought itself has subsided. The persistence of drought impacts has received limited attention in the economics literature. The objectives of this study are two-fold: 1) to determine whether inter-year dynamics, in the form of agronomic constraints and financial flows, can cause persistence of a drought's impact in years subsequent...

Evaluation of EPIC for Three Minnesota Cropping Systems

Palavras-chave: Drought; Preparedness; Response; Uncertainty; Dynamics; Discrete stochastic programming; Agriculture; Irrigation; Eastern Oregon; Row crops; Crop rotation; Crop Production/Industries; Risk and Uncertainty.

Ano: 2007

URL: http://purl.umn.edu/9253

Chung, S.W.; Gassman, Philip W.; Huggins, David R.; Randall, G.W..

The Erosion Productivity Impact Calculator (EPIC) model was tested using four years of field data collected at a site near Lamberton, Minnesota, under three different crop rotations: continuous corn (Zea mays L.) or CC, soybean (Glycine max L.)-corn (SC), continuous alfalfa (Medicago sativa L.) or CA. The model was evaluated by comparing measured versus predicted subsurface drainage flow (tile flow), nitrate-nitrogen (NO3-N) loss in tile flow, residual NO3-N in the soil profile, crop N uptake, and yield. Initially, EPIC was run using standard Soil Conservation Service (SCS) runoff curve numbers (CN2) suggested for the soil type at the site. Two different SC runs were performed with a nitrogen fixation parameter denoted as parm(7) set at either 1.0 or 0.3,...

Tipo: Working or Discussion Paper

Palavras-chave: Modeling; Water quality; Crop rotation; Tile drainage; Nitrate leaching; Fertilizer; Crop Production/Industries.

Ano: 2000

URL: http://purl.umn.edu/18479

Physical properties of an Alfisol and no-till soybean yield

Tavares Filho,João; Guimarães,Maria de Fátima; Curmi,Pierre; Tessier,Daniel.

It is known that any kind of soil management causes changes in the soil physical characteristics and can affect agricultural yield. The purpose of this study was to evaluate soil properties of an Alfisol and soybean yield under different management systems for no-tillage annual crops, no-tillage with chiseling and no-tillage crop rotation. The 11-year experiment was initiated in the 1998/99 growing season, on 100 x 30 m plots (11 % slope). Soil samples (5 per management system) were systematically collected (0-25 cm layer) in the summer growing season, to quantify soil organic matter, bulk density, macroporosity and flocculation, as well as soybean yield. The highest values for soil bulk density and organic matter content and the lowest for macroporosity...

Physical properties of a humic cambisol under tillage and cropping systems after twelve years

Palavras-chave: No tillage; Soil physical properties; Organic matter; Crop rotation.

Ano: 2012

URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832012000100026

Andrade,Andréia Patrícia; Mafra,Álvaro Luiz; Baldo,Gizele Rejane; Piccolla,Cristiano Dela; Bertol,Ildegardis; Albuquerque,Jackson Adriano.

Soil is the basis underlying the food production chain and it is fundamental to improve and conserve its productive capacity. Imbalanced exploitation can degrade agricultural areas physical, chemical and biologically. The objective of this study was to evaluate some soil physical properties and their relation with organic carbon contents of a Humic Dystrudept under conventional tillage (CT) and no-tillage (NT), for 12 years in rotation (r) and succession (s) cropping systems. The experiment was carried out in Lages, SC (latitude 27 º 49 ' S and longitude 50 º 20 ' W, 937 m asl), using crop sequences of bean-fallow-maize-fallow-soybean in conventional tillage rotation; maize-fallow in conventional tillage succession; bean-oat-maize-turnip-soybean-vetch in...

Crop response to organic fertilization with supplementary mineral nitrogen

Palavras-chave: Crop rotation; Crop succession; No-tillage; Soil management.

Ano: 2010

URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832010000100022

Ciancio,Nathalia Riveros; Ceretta,Carlos Alberto; Lourenzi,Cledimar Rogério; Ferreira,Paulo Ademar Avelar; Trentin,Gustavo; Lorensini,Felipe; Tiecher,Tadeu Luis; De Conti,Lessandro; Girotto,Eduardo; Brunetto,Gustavo.

Animal manure is applied to the soil as a nutrient source, especially of nitrogen, to plants. However, manure application rates can be reduced with the use of N fertilizer in topdressing. The aim of this study was to evaluate crop responses to different application rates of animal manure sources, used alone and supplemented with mineral N topdressing, in a no-tillage system. The study was carried out from 2005 to 2008 on a Hapludalf soil. The treatments consisted of rates of 10, 20 and 30 m³ ha-1 of pig slurry (PS), and of 1 and 2 t ha-1 of turkey manure (TM), applied alone and supplemented with topdressed N fertilizer (TNF), as well as two controls, mineral fertilization (NPK) and one control without fertilizer application. Grain yield in common bean and...

Congo grass grown in rotation with soybean affects phosphorus bound to soil carbon

Palavras-chave: Animal manure; Crop rotation; No-tillage cropping system.

Ano: 2014

URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832014000300023

Merlin,Alexandre; He,Zhenli L.; Rosolem,Ciro Antonio.

The phosphorus supply to crops in tropical soils is deficient due to its somewhat insoluble nature in soil, and addition of P fertilizers has been necessary to achieve high yields. The objective of this study was to examine the mechanisms through which a cover crop (Congo grass - Brachiaria ruziziensis) in rotation with soybean can enhance soil and fertilizer P availability using long-term field trials and laboratory chemical fractionation approaches. The experimental field had been cropped to soybean in rotation with several species under no-till for six years. An application rate of no P or 240 kg ha-1 of P2O5 had been applied as triple superphosphate or as Arad rock phosphate. In April 2009, once more 0.0 or 80.0 kg ha-1 of P2O5 was applied to the same...

Effect of cropping systems in no-till farming on the quality of a Brazilian Oxisol

Palavras-chave: Crop rotation; No-till; Organic P; Phosphorus fractionation.

Ano: 2014

URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832014000300020

Seben Junior,Getulio de Freitas; Corá,José Eduardo; Lal,Rattan.

The no-till system with complex cropping sequences may improve the structural quality and carbon (C) sequestration in soils of the tropics. Thus, the objective of this study was to evaluate the effects of cropping sequences after eight years under the no-till system on the physical properties and C sequestration in an Oxisol in the municipality of Jaboticabal, Sao Paulo, Brazil. A randomized split-block design with three replications was used. The treatments were combinations of three summer cropping sequences - corn/corn (Zea mays L.) (CC), soybean/soybean (Glycine max L. Merryll) (SS), and soybean-corn (SC); and seven winter crops - corn, sunflower (Helianthus annuus L.), oilseed radish (Raphanus sativus L.), pearl millet (Pennisetum americanum (L.)...

Physical properties and particle-size fractions of soil organic matter in crop-livestock integration

Palavras-chave: Cerrado; Crop rotation; Winter crops; Soil aggregates; Least limiting water range; Bulk density.

Ano: 2014

URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832014000400023

Tirloni,Carolina; Vitorino,Antonio Carlos Tadeu; Bergamin,Anderson Cristian; Souza,Luiz Carlos Ferreira de.

Crop-livestock integration represents an interesting alternative of soil management, especially in regions where the maintenance of cover crops in no-tillage systems is difficult. The objective of this study was to evaluate soil physical and chemical properties, based on the hypothesis that a well-managed crop-livestock integration system improves the soil quality and stabilizes the system. The experiment was set up in a completely randomized design, with five replications. The treatments were arranged in a 6 x 4 factorial design, to assess five crop rotation systems in crop-livestock integration, and native forest as reference of soil undisturbed by agriculture, in four layers (0.0-0.05; 0.05-0.10; 0.10-0.15 and 0.15-0.20 m). The crop rotation systems in...

Crop sequences in no-tillage system: effects on soil fertility and soybean, maize and rice yield

Palavras-chave: Crop rotation; No-tillage system; Soil quality; Soil carbon; Aggregate stability.

Ano: 2012

URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832012000400024

Marcelo,Adolfo Valente; Corá,José Eduardo; Fernandes,Carolina; Martins,Márcio dos Reis; Jorge,Ricardo Falqueto.

Decomposing crop residues in no-tillage system can alter soil chemical properties, which may consequently influence the productivity of succession crops. The objective of this study was to evaluate soil chemical properties and soybean, maize and rice yield, grown in the summer, after winter crops in a no-tillage system. The experiment was carried out in Jaboticabal, SP, Brazil (21 ° 15 ' 22 '' S; 48 ° 18 ' 58 '' W) on a Red Latosol (Oxisol), in a completely randomized block design, in strip plots with three replications. The treatments consisted of four summer crop sequences (maize monocrop, soybean monocrop, soybean/maize rotation and rice/bean/cotton rotation) combined with seven winter crops (maize, sunflower, oilseed radish, pearl millet, pigeon pea,...

Postharvest nitrous oxide emissions from a subtropical oxisol as influenced by summer crop residues and their management

Palavras-chave: Winter crops; Crop rotation; Cover crops; Soil management.

Ano: 2009

URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832009000200019

Escobar,Luisa Fernanda; Amado,Telmo Jorge Carneiro; Bayer,Cimélio; Chavez,Luis Fernando; Zanatta,Josiléia Acordi; Fiorin,Jackson Ernani.

Nitrous oxide (N2O) is the most important non-CO2 greenhouse gas and soil management systems should be evaluated for their N2O mitigation potential. This research evaluated a long-term (22 years) experiment testing the effect of soil management systems on N2O emissions in the postharvest period (autumn) from a subtropical Rhodic Hapludox at the research center FUNDACEP, in Cruz Alta, state of Rio Grande do Sul. Three treatments were evaluated, one under conventional tillage with soybean residues (CTsoybean) and two under no-tillage with soybean (NTsoybean) and maize residues (NTmaize). N2O emissions were measured eight times within 24 days (May 2007) using closed static chambers. Gas flows were obtained based on the relations between gas concentrations in...

Stabilization of soil hydraulic properties under a long term no-till system

Palavras-chave: Global warming; Subtropical soils; Greenhouse gases; Soil tillage; Crop rotation.

Ano: 2010

URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832010000200024

Lozano,Luis Alberto; Germán Soracco,Carlos; Buda,Vicente S.; Sarli,Guillermo O.; Filgueira,Roberto Raúl.

The area under the no-tillage system (NT) has been increasing over the last few years. Some authors indicate that stabilization of soil physical properties is reached after some years under NT while other authors debate this. The objective of this study was to determine the effect of the last crop in the rotation sequence (1st year: maize, 2nd year: soybean, 3rd year: wheat/soybean) on soil pore configuration and hydraulic properties in two different soils (site 1: loam, site 2: sandy loam) from the Argentinean Pampas region under long-term NT treatments in order to determine if stabilization of soil physical properties is reached apart from a specific time in the crop sequence. In addition, we compared two procedures for evaluating water-conducting...

Pig slurry and nutrient accumulation and dry matter and grain yield in various crops

Palavras-chave: Infiltration; Crop rotation; Water-conducting porosity; No tillage; Texture.

Ano: 2014

URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832014000400024

Lourenzi,Cledimar Rogério; Ceretta,Carlos Alberto; Brunetto,Gustavo; Girotto,Eduardo; Tiecher,Tadeu Luis; Vieira,Renan Costa Beber; Cancian,Adriana; Ferreira,Paulo Ademar Avelar.

Pig slurry (PS) represents an important nutrient source for plants and using it as fertilizer makes greater nutrient cycling in the environment possible. The aim of this study was to assess how PS application over a period of years can affect grain yield, dry matter production and nutrient accumulation in commercial grain and cover crops. The experiment was carried out in an experimental area of the Universidade Federal de Santa Maria, in Santa Maria, RS, Brazil, from May 2000 to January 2008. In this period, 19 grain and cover crops were grown with PS application before sowing, at rates of 0, 20, 40 and 80 m³ ha-1. The highest PS rate led to an increase in nutrient availability over the years, notably of P, but also of nutrients that are potentially toxic...

Least limiting water range in soil under crop rotations and chiseling

Palavras-chave: Manure; Yield; Crop rotation.

Ano: 2014

URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832014000300027

Calonego,Juliano Carlos; Rosolem,Ciro Antonio.

Soil water availability to plants is affected by soil compaction and other variables. The Least Limiting Water Range (LLWR) comprises soil physical variables affecting root growth and soil water availability, and can be managed by either mechanical or biological methods. There is evidence that effects of crop rotations could last longer than chiseling, so the objective of this study was to assess the effect of soil chiseling or growing cover crops under no-till (NT) on the LLWR. Crop rotations involving triticale (X Triticosecale) and sunflower (Helianthus annuus) in the fall-winter associated with millet (Pennisetum glaucum), sorghum (Sorghum bicolor) and sunn hemp (Crotalaria juncea) as cover crops preceding soybean (Glycine max) were repeated for three...

Inter-relation between soybean yield and soil compaction under degraded pasture in Brazilian Savannah

Palavras-chave: Cover crops; Crop rotation; Soil compaction; No till; Soil water.

Ano: 2011

URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832011000300012

Queiroz,Rienni de Paula; Lazarini,Edson; Santos,Marcio Lustosa; Carvalho,Morel de Passos e; Santos,Cristiano.

The Cerrado (Brazilian Savannah) plays an important economic and financial role in the nation, since the pastures of this biome feed cattle for half of the domestic bovine meat productivity, and its agricultural fields produce a third of the country's grain. The variability and spatial dependence between the soil physical attributes and soybean yield were evaluated in a crop rotation planted on a degraded brachiaria pasture, on a dystroferric Red Latosol of an experimental farm of the State University of São Paulo (UNESP), in the 2005/2006 growing season. The linear and spatial correlations between these attributes were also studied, to determine conditions that would allow increased agricultural productivity. In the above pasture area, a grid was...