For the first time since the 1960s the yields of the world's most important crops, wheat and rice, are rising more slowly than the global population (see special report).
当前是自二十世纪六十年代以来，世界上第一次出现重要农作物——小麦和大米——产量的增幅小于全球人口增长(请阅读专题报道)。
The field experiments were carried out to evaluate the rice yields, economic benefits and soil fertility of ryegrass-rice and wheat-rice cropping systems under different nitrogen fertilizer rates.
通过田间试验研究了不同氮肥水平黑麦草—水稻和小麦—水稻两种种植模式的水稻产量、经济效益和对土壤肥力的影响。
It is reported that, inaction will lead to a maximum decline of yields of China's main crops, e. g. wheat, rice and maize, by the later half of 21st century.
研究表明，如果不采取任何措施，到21世纪后半期，中国主要农作物，如小麦、水稻和玉米的产量最多可下降37%。
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