narcotic
发表于 2025-3-28 17:56:22
Efficient fertilizer use for crop production: The Gambia experience,d and incorporated outperformed that which was broadcast and left on the soil surface. Tilemsi phosphate rock from Mali was agronomically as effective as commercial superphosphates in terms of both direct effects and residual effects thereby confirming the place of this phosphate rock as one of West Africa’s best for direct application.
可以任性
发表于 2025-3-28 21:25:22
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生气的边缘
发表于 2025-3-29 00:50:10
Role of manures and crop residue in alleviating soil fertility constraints to crop production: Withrop residue for soil fertility improvement cannot be overstressed. It is essential that more information on the rates of organic matter decomposition as well as the many reactions between products of organic matter decomposition and the soil under WASAT conditions be made available.
NOT
发表于 2025-3-29 05:56:20
Book 1991rials 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 of the soi
Hemiplegia
发表于 2025-3-29 10:41:16
Alleviating fertilizer policy constraints to increased fertilizer use and increased food productiond growth in agricultural production. The influx of commercially imported or donated foodgrains has helped many governments to maintain a policy of low food prices, usually for the benefit of the vocal urban dwellers. Such practices tend to kill the incentive for increased local production of foodgra
奇思怪想
发表于 2025-3-29 14:08:44
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:
终点
发表于 2025-3-29 18:59:48
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路标
发表于 2025-3-29 23:46:01
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
要素
发表于 2025-3-30 03:37:19
Alleviating soil fertility constraints to food production in West Africa: Efficiency of nitrogen fesuch as N rate, mode of N fertilizer application and choice of N sources for different agroecological zones of West Africa are discussed in relation to crop yield response. The interactive effects of cropping density and rainfall on N efficiency and yield are examined with particular emphasis on pro
ADORE
发表于 2025-3-30 07:10:33
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