The effect of further higher density on corn yield should be studied. 應進(jìn)一步研究更高的密度如何影響玉米產(chǎn)量。
The phosphorus fertilizer and farmyard manure had the best effects on maize yield in Drab Fluvo-aquic soil. 相關(guān)分析表明，在褐潮土上增施磷肥和有機肥對提高玉米產(chǎn)量具有重要的作用。
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