观点
发表于 2025-3-25 05:41:14
B. Milner,V. Rapoport,L. Yevenkohe level of soil organic matter have resulted in decreased soil productivity. The addition of organic materials either in the form of manures or crop residue has beneficial effects on the soils’ chemical and physical properties. For many of the countries in this region, the amounts of nutrients in c
ORBIT
发表于 2025-3-25 09:00:19
Mustafijur Rahman,Ramesh Harjanie region has declined over the years. The ratio between production and apparent demand fell from 0.38 in 1970/71 to 0.23 in 1987/88. To alleviate fertilizer supply constraints and reduce costs, the following measures are recommended to governments, donor agencies and research institutions:
隐藏
发表于 2025-3-25 13:19:41
https://doi.org/10.1007/978-3-319-57033-4e trend of declining yields. Developing better understanding of such climate-related constraints as high intensity storms, inadequate rainfall or poor rainfall distribution, high temperatures and high evaporative demands, excessive rainfall and high erodibility of soils will result in measures that can overcome or mitigate these constraints.
Nomadic
发表于 2025-3-25 18:20:44
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LUCY
发表于 2025-3-25 23:13:11
Alleviating fertilizer supply constraints in West Africa,e region has declined over the years. The ratio between production and apparent demand fell from 0.38 in 1970/71 to 0.23 in 1987/88. To alleviate fertilizer supply constraints and reduce costs, the following measures are recommended to governments, donor agencies and research institutions:
报复
发表于 2025-3-26 02:53:56
Climatic constraints to crop production and fertilizer use,e trend of declining yields. Developing better understanding of such climate-related constraints as high intensity storms, inadequate rainfall or poor rainfall distribution, high temperatures and high evaporative demands, excessive rainfall and high erodibility of soils will result in measures that can overcome or mitigate these constraints.
拔出
发表于 2025-3-26 04:36:05
arent materials of the soils of tropical Africa are old, highly weathered and devoid of bases and phosphate-bearing minerals. Traditional farming systems which were relatively stable and sustainable relied on long fallow periods after one to two years of cropping to maintain the productive capacity
咽下
发表于 2025-3-26 12:17:04
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Dedication
发表于 2025-3-26 13:57:45
Efficient fertilizer use for increased crop production: Use of phosphorus fertilizers in concretiontic concretions. Phosphorus desorption, however showed the opposite trend. Phosphorus sorption isotherms were also used to estimate phosphorus fertilizer rates on the concretional soils. The growth and yield of millet approached maximum when the sorption equilibrium solution P level was 0.2 ppm.
prodrome
发表于 2025-3-26 20:34:57
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