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The effects of manure application on soil aggregation
Springer Science and Business Media LLC - Tập 80 - Trang 173-180 - 2007
C. S. Wortmann, C. A. Shapiro
Surface application of manure may increase the risk of phosphorus loss in runoff. Manure application, however, often results in increased soil aggregate stability with reduced runoff and erosion and, therefore, reduced P transport potential. Three field studies were conducted with silt loam or silty clay loam soil in Nebraska to determine how water-stable soil aggregation in the 0- to 25-mm soil d...... hiện toàn bộ
Tillage and residue management effects on soil carbon and CO2 emission in a wheat–corn double-cropping system
Springer Science and Business Media LLC - Tập 83 - Trang 27-37 - 2008
Wenxu Dong, Chunsheng Hu, Suying Chen, Yuming Zhang
The mitigation of CO2 emission into the atmosphere is important and any information on how to implement adjustments to agricultural practices and improve soil organic matter (SOM) stock would be helpful. We studied the effect of tillage and residue management on soil carbon sequestration and CO2 emissions in loam soil cropped in a winter wheat–corn rotation in northern China. There were five treat...... hiện toàn bộ
Mineralogical, chemical and solubility variations in the Eppawala phosphate deposit of Sri Lanka ? a case for selective mining for fertilizers
Springer Science and Business Media LLC - - 1991
Kapila Dahanayake, S. M. N. D. Subasinghe
Nitrogen cycling assessment in a hedgerow intercropping system using 15N enrichment
Springer Science and Business Media LLC - Tập 62 - Trang 1-9 - 2002
Johannes Lehmann, Gerhard Gebauer, Wolfgang Zech
Nitrogen (N) cycling was determined in monocultures of Sorghumbicolor (L.) Moench and alley cropped sorghum with Acaciasaligna (Labill.) H. Wendl. in semiarid Northern Kenya. N inputthrough biological N2 fixation of the acacia, N transfer from thelegume to the intercrop and losses of applied N through harvest and leachingwere estimated using 15N enrichment. The biological N2fixation and N transfer...... hiện toàn bộ
Effect of ortho- and pyrophosphates on dissolution of Fe, Al, Si, Ca, and organic C in three soils
Springer Science and Business Media LLC - Tập 20 - Trang 51-58 - 1989
R. J. Xie, A. F. MacKenzie
Phosphate application changes chemical properties of surface soils, consequently influencing crop nutrient availability and pedological process. Sodium ortho- (OP) or pyrophosphate (PP) was equilibrated with three Quebec soils: an Uplands sand (Orthic-Podzol), a St. Bernard loam (Eutric-Cambisol), and a Dalhousie clay (Humic Gleysol) in 0.03 M KClO4 solution at an initial pH 6.0. Both autoclaved a...... hiện toàn bộ
The comparison of nitrogen use and leaching in sole cropped versus intercropped pea and barley
Springer Science and Business Media LLC - Tập 65 - Trang 289-300 - 2003
H. Hauggaard-Nielsen, P. Ambus, E.S. Jensen
The effect of sole and intercropping of field pea (Pisumsativum L.) and spring barley (Hordeum vulgareL.) and of crop residue management on crop yield,NO3 − leaching and N balance in the cropping systemwas tested in a 2-year lysimeter experiment on a temperate sandy loam soil. Thecrop rotation was pea and barley sole and intercrops followed by winter-rye anda fallow period. The Land Equivalent Rat...... hiện toàn bộ
Fertilizing programs
Springer Science and Business Media LLC - Tập 8 - Trang 39-47 - 1985
JD Colwell
Alternative programs for applications of fertilizer phosphorus to successive crops are computed from the data of long term experiments showing the effects of fresh fertilizer applications and of residues from applications to previous crops on the yields of wheat in Australia and of soybeans in Brazil. The programs are compared on the basis of total economic returns with allowance for the time scal...... hiện toàn bộ
Effect of farmer management strategies on spatial variability of soil fertility and crop nutrient uptake in contrasting agro-ecological zones in Zimbabwe
Springer Science and Business Media LLC - Tập 88 - Trang 111-120 - 2009
E. N. Masvaya, J. Nyamangara, R. W. Nyawasha, S. Zingore, R. J. Delve, K. E. Giller
Variability of soil fertility within, and across farms, poses a major challenge for increasing crop productivity in smallholder systems of sub-Saharan Africa. This study assessed the effect of farmers’ resource endowment and nutrient management strategies on variability in soil fertility and plant nutrient uptake between different fields in Gokwe South (ave. rainfall ~650 mm year−1; 16.3 persons k...... hiện toàn bộ
Nitrate distribution and accumulation in an Ustochrept soil profile in a long term fertilizer experiment
Springer Science and Business Media LLC - Tập 28 - Trang 173-177 - 1991
D. K. Benbi, C. R. Biswas, J. S. Kalkat
Distribution and accumulation of NO3—N, down to 210 cm depth, in the soil profile of a long term fertilizer experiment were studied after 16 cycles of cropping (maize-wheat-fodder cowpea). The application of fertilizer N without P and K or in combination with only P resulted in higher NO3—N concentration in the soil profile than the application of N with P and K. With an annual application of 320 ...... hiện toàn bộ
Thermoplastic matrix controlled-release zinc fertilizers
Springer Science and Business Media LLC - Tập 17 - Trang 251-266 - 1988
D. C. Joyce, L. C. Bell, D. G. Edwards, C. J. Asher
The emission and movement of zinc from planar arrangements of controlled-release (C.R.) thermoplastic matrix zinc fertilizer formulations was studied in cylindrical diffusion cells packed with a clay or a sand. The influences of a number of soil characteristics known to affect zinc diffusion were also investigated. Zinc emission was initially (over 2 days) very rapid. The rate declined markedly th...... hiện toàn bộ
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