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The effects of manure application on soil aggregation
Springer Science and Business Media LLC - Tập 80 - Trang 173-180 - 2007
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...
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
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...
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
Nitrogen cycling assessment in a hedgerow intercropping system using 15N enrichment
Springer Science and Business Media LLC - Tập 62 - Trang 1-9 - 2002
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...
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
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...
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
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...
Fertilizing programs
Springer Science and Business Media LLC - Tập 8 - Trang 39-47 - 1985
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...
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
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...
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
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 ...
Thermoplastic matrix controlled-release zinc fertilizers
Springer Science and Business Media LLC - Tập 17 - Trang 251-266 - 1988
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...
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