宗教节日必须在一年中恰当的时间举行，农作物也必须在适当的时间种植。
Religious festivals had to be held at the right time of year, crops needed to be planted at the right time as well.
一片庄稼地在昆虫啃食粮食作物的时候会发光，这样就让灭虫剂在适当的时候才被使用。
A field would glow in areas where insects were attacking the crops, allowing insecticides to be deployed appropriately.
如果作物没有适当轮替，土壤中的养分会耗尽，几年后就什么东西也种不出来了。
If crops are not rotated properly, nutrients in the soil are stripped out, and nothing can be grown for several years.
他补充说：如果能实施适当的农业政策，（科学家）提供更好的农作物品种和更精良的技术，欠发达国家就可以做到自给自足。
'LDCs are capable of feeding themselves now,' he added, 'if they adopt appropriate agrarian policies and . . . [scientists] give us better varieties and improved technology.'
提出的对策是：要重视蔬菜的施肥技术的研究，适当控制蔬菜作物的施肥量。
The countermeasure is to emphasize the study on applying technology of vegetable fertilizer and properly control the amount.
作物当时的营养状况，可在适当时期对植物的系统采样进行营养分析。
The current nutrient status of crops can now be determined through the systematic sampling of plants as appropriate times.
适当地扩大油菜面积和调减小麦面积是协调粮经作物关系的可行途径。
The appropriate increasing of rape area and the decreasing of wheat area is a suitable way for readjustment of relationship between food crop and economic crop.
洪泛区建筑、不可持续的人口迁移和不适当的农作物耕地，所有这些都会促使环境恶化。
Construction on flood plains, unsustainable population movements and inappropriate crop plantation all contribute to harmful environmental change.
不适当的灌溉方法的地区排水不良的土壤可能导致盐矿床抑制植物生长，并可能导致作物歉收。
Improper irrigation practices in areas with poorly drained soil may result in salt deposits that inhibit plant growth and may lead to crop failure.
不适当的灌溉方法的地区排水不良的土壤可能导致盐矿床抑制植物生长，并可能导致作物歉收。
Improper irrigation practices in areas with poorly drained soil may result in salt deposits that inhibit plant growth and may lead to crop failure.
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