Studies on the effect of soil water and fertilizer on soybean yield on loess slope farmland showed that soybean yield ( Y ) increased linearly with the increase of water use efficiency (WUE).Soybean yield and WUE increase with the increase of P fertilizer when P fertilizer was applied alone,but increased firstly and then decreased with the increase of N fertilizer when N fertilizer was applied alone. Therefore, N fertilizer should be applied with P fertilizer. Compared to no fertilizer, fertilizer could s...
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