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| Registros recuperados: 158 | |
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| Costa,Andréa R. F. C. da; Medeiros,José F. de. |
| ABSTRACT The use of saline water in agriculture has increased in the Brazilian semiarid due to low availability of good quality water for irrigated agriculture, being the selection of salt tolerant hybrids an alternative to reduce the effect of salinity on nutritional status of plants. So, the objective of this work was to evaluate the effect of salinity of irrigation water in the accumulation and partition of nutrients in the vegetable tissue of watermelon cultivars, in the region of Mossoro in the State of Rio Grande do Norte, Brazil. The treatments studied consisted of applying irrigation water with five electrical conductivities (EC1 = 0.57, EC2 = 1.36, EC3 = 2.77, EC4 = 3.86 and EC5 = 4.91 dS m-1), two watermelon cultivars and four samplings times... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Citrullus lanatus; Plant nutritional status; Water management. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162018000300343 |
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| Lehrsch, G.; Sojka, R.; Westermann, D.. |
| Banding and sidedressing nitrogen (N) fertilizer on a never-irrigated side of a row of corn (Zea mays L.) were hypothesized to maintain yield and decrease nitrate leaching. In a two—year ?eld study on a Portneuf silt loam (Durinodic Xeric Haplocalcid) in southern Idaho, we evaluated effects on yield and N uptake of 1) urea placement (broadcast pre-plant vs. band at planting), 2) row spacings (30-in vs. an offset 22—in spacing in which every pair of 22-—in rows was positioned close to a furrow rather than each row on a bed center), and 3) water management. Our water management, termed irrigated furrow positioning, consisted of every- second furrow irrigation in which we applied water to either a) the same or b) the Opposite side of the row with... |
| Tipo: Conference or Workshop Item |
Palavras-chave: Corn / maize; Water management; Mass Import - autoclassified (may be erroneous). |
| Ano: 2008 |
URL: http://eprints.nwisrl.ars.usda.gov/1267/7/1243.pdf |
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| Lehrsch, G.A.; Gallian, J.J.. |
| Oilseed radish (Raphanus sativus spp. oleifera) reduces sugarbeet cyst nematode (Heterodera schachtii) populations. Fall-incorporated radish biomass may also increase the yield and quality of subsequently grown sugarbeet (Beta vulgaris L.) by improving soil physical and hydraulic properties. This field study determined radish effects on nearsurface soil aggregate stability, water-stable aggregate size distribution, bulk density, and field-saturated water content, as well as infiltration and hydraulic conductivity measured at water supply potentials of ‑40, ‑20, and +0 mm H2O. In 2003 and 2004 in Twin Falls, ID, radish were grown in a Portneuf silt loam (Durinodic Xeric Haplocalcid) for about 10 weeks in the fall, then incorporated later that fall by... |
| Tipo: Article |
Palavras-chave: Water management; Water. |
| Ano: 2010 |
URL: http://eprints.nwisrl.ars.usda.gov/1381/1/1357.pdf |
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| Heyd, Helene; Neef, Andreas. |
| In the early 1990s, Thailand launched an ambitious program of decentralized governance, conferring greater responsibilities upon sub-district administrations and providing fiscal opportunities for local development planning. This process was reinforced by Thailand’s new Constitution of 1997, which explicitly assures individuals, communities and local authorities the right to participate in the management of natural resources. Drawing on a study of water management in the Mae Sa watershed, northern Thailand, this study analyzes to what extent the constitutional right for participation has been put into practice. To this end, a stakeholder analysis was conducted in the watershed, with a focus on the local people’s interests and strategies in water management... |
| Tipo: Working or Discussion Paper |
Palavras-chave: Participation; Water management; Water policy; Stakeholders; Thailand; Resource /Energy Economics and Policy. |
| Ano: 2004 |
URL: http://purl.umn.edu/60326 |
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| Kendy, Eloise; Molden, David J.; Steenhuis, Tammo S.; Liu, Changming; Wang, Jinxia. |
| The report examines the relationships between agricultural policies in the North China Plain, the approaches to water management that evolved from them, the quantity of water that was actually used, and the consequent groundwater depletion beneath Luancheng County, Hebei Province, from 1949 to 2000. To systematically address these relationships, we use a comprehensive water-balance approach. Our results indicate that a single, longstanding policy-that of using groundwater to meet the crop-water requirements not supplied by precipitation-is responsible for the steady rate of groundwater decline. |
| Tipo: Report |
Palavras-chave: Agricultural production; Groundwater; Aquifers; Water shortage; Irrigation efficiency; Agricultural policy; Crop production; Wastewaters; Water management; Hydrology; Economic development; Crop yield; Cotton; Wheat; Sprinkler irrigation; Water conservation; Water use efficiency; Pumping; Water balance; Vegetables; Rural economy; Irrigated framing; Community/Rural/Urban Development; Crop Production/Industries; Environmental Economics and Policy. |
| Ano: 2003 |
URL: http://purl.umn.edu/44560 |
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| Lentz, R.D.; Kincaid, D.C.. |
| Irrigation water supplies are becoming limited, and there is a need to extend the usefulness of current water resources. Previous laboratory studies demonstrated that certain water-soluble polyacrylamide solution (WSPAM) and cross-linked PAM granule (XPAM) treatments effectively reduced infiltration into soils. We evaluated the efficacy of these treatments for reducing water seepage losses in an unlined irrigation reservoir. Five treatments were applied to plots on the lower side slopes of a reservoir basin before it was filled in April 2001: controls; 0.016 kg m -2 WSPAM (1000 mg L -1 solution); 0.2 kg m -2 XPAM + 0.13 kg m -2 NaCl; 0.4 kg m -2 XPAM + 0.13 kg m -2 NaCl; and 0.8 kg m -2 XPAM only. Ring-cylinder seepage meters installed in each experimental... |
| Tipo: Article |
Palavras-chave: Water management. |
| Ano: 2008 |
URL: http://eprints.nwisrl.ars.usda.gov/1272/1/1249.pdf |
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| Mendes,Walter da C.; Alves Júnior,José; Cunha,Paulo C. R. da; Silva,Anderson R. da; Evangelista,Adão W. P.; Casaroli,Derblai. |
| ABSTRACT Potassium (K) can be easily lost by the leaching process. The objective of this study was to quantify K leaching in clayey and sandy soils under increasing irrigation depths. The experiment was conducted in 2014, in a protected environment, after extraction of undisturbed soil columns, with diameter of 144 mm and height of 300 mm. The columns were arranged in a randomized complete block in a factorial design with three replicates, corresponding to eight treatments: two soil types and four water depths, equivalent to 50, 100, 150 and 200% of the amount of water necessary to bring the soil moisture to field capacity. Potassium chloride, with 58% of K2O, was used as K source. Water replacement in the columns was performed every three days, for a... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Fertilization; Soil texture; Nutrient loss; Water management. |
| Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662016001100972 |
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| Stark, J.C.; Love, S.; King, B.A.; Marshall, J.M; Bohl, W.H.; Salaiz, T.. |
| The ability to minimize potato yield and quality losses due to drought can be greatly improved by understanding the relative responses of different cultivars to seasonal variations in water supply. To address this need, we initiated a two year field experiment to determine the responses of the six potato cultivars to different seasonal drought patterns, including 1) full season irrigation at 100% ET, 2) irrigation at 100% ET terminated during late bulking , 3) full season irrigation at 70% ET , 4) irrigation at 70% ET terminated during late bulking , and 5) a gradual reduction in irrigation from 100% ET during tuber initiation through early bulking, to 70% ET during mid-bulking, and 50% ET through late bulking. GemStar Russet and Ranger Russet, two... |
| Tipo: Article |
Palavras-chave: Potato; Water management. |
| Ano: 2013 |
URL: http://eprints.nwisrl.ars.usda.gov/1503/1/1466.pdf |
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| SILVA, M. S. L. da; OLIVEIRA NETO, M. B. de; SILVA, A. F.; FERNANDES, F. E. P.; SOUZA, S. L. de; OLIVEIRA, L. S.; FELISBERTO, N. R. de O.; ARAUJO FILHO, J. C. de; PARAHYBA, R. da B. V.; SILVA, T. D. S. da; LIMA, L. M. J. M.; LIMA, R. A.. |
| A presente pesquisa teve como objetivo realizar diagnóstico participativo de agroecossistemas com criação de caprinos leiteiros, para recomendação de práticas de uso e manejo do solo e da água, para sistemas de produção em Arranjos Produtivos Locais de leite caprino do Semiárido de Pernambuco e da Paraíba, considerando o conhecimento tradicional e técnico-científico local da capacidade de uso das terras e do uso e da qualidade da água. O estudo primou pela resiliência socioecológica desses agroecossistemas às adversidades do clima Semiárido, contribuindo, assim, com a gestão sustentável de núcleos familiares da caprinocultura leiteira do Semiárido do Nordeste brasileiro. |
| Tipo: Folhetos |
Palavras-chave: Agroecossistema; Selo ODS; Manejo do Solo; Manejo de Água; Sistema de Produção; Caprino; Soil management; Water management; Agroecosystems; Product system; Goats. |
| Ano: 2022 |
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/1148982 |
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| Colauto,Nelson Barros; Silveira,Adriano Reis da; Eira,Augusto Ferreira da; Linde,Giani Andrea. |
| This study aimed to verify the biological efficiency and production flushes of Agaricus blazei strains on different casing layers during 90 cultivation days. Four casing layers were used: mixture of subsoil and charcoal (VCS), lime schist (LSC), São Paulo peat (SPP) and Santa Catarina peat (SCP); and two genetically distant A. blazei strains. The fungus was grown in composted substratum and, after total colonization, a pasteurized casing layer was added over the substratum, and fructification was induced. Mushrooms were picked up daily when the basidiocarp veil was stretched, but before the lamella were exposed. The biological efficiency (BE) was determined by the fresh basidiocarp mass divided by the substratum dry mass, expressed in percentage. The... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Production flush; Agaricus brasiliensis; Casing layer; Water management; Agaricus subrufescens. |
| Ano: 2011 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822011000200026 |
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| Hussain, Intizar; Marikar, Fuard; Jehangir, Waqar Ahmed. |
| A study of the enormous differences in agricultural productivity that exist across farms and regions in Pakistan, where, for example, recent farm-level data from Sindh, indicates that irrigated wheat output per hectare varies from 0.5 to 5.4 tons across farms. Looks at the central goal of agricultural policy in the country, viz. improving and sustaining productivity, narrowing the existing productivity gaps, and enhancing resource use efficiencies to meet food requirements of a rapidly growing population. |
| Tipo: Report |
Palavras-chave: Irrigated farming; Wheat; Productivity; Performance evaluation; Water management; Cropping systems; Water supply; Soil properties; Models; Pakistan; Lower Indus Basin; Agribusiness; Agricultural Finance; Crop Production/Industries; Environmental Economics and Policy; Farm Management; Production Economics; Productivity Analysis. |
| Ano: 2000 |
URL: http://purl.umn.edu/53023 |
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| Registros recuperados: 158 | |
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