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我县是海拔800~1600米的山区,馬鈴薯栽培面积达15万亩。氨磷含量貧泛,曾进行山地黃土馬鈴薯磷肥肥效試驗。結果亩施过磷酸鈣60斤、50斤、40斤和20斤分別比对照增产馬鈴薯320斤、240斤、260斤和32斤。即分別增产50%、37.5%、40%和5%。增产原因可能是山地黃土含有大量的氧化鉄及氧化鋁,对磷肥有强烈的固定作用,使土壤中的磷素大部分变成难溶状态。在这种条件下增施磷肥,又采用穴施法,是有效果的。
My county is 800 ~ 1600 meters above sea level in the mountains, potato cultivation area of 15 acres. Ammonia Phosphorus content of the pan-poor, had conducted loess potash fertilizer experiment. The results of Mushu over 60 kg of calcium phosphate, 50 pounds, 40 pounds and 20 pounds of potato were increased compared with the control of 320 pounds, 240 pounds, 260 pounds and 32 pounds. That is, an increase of 50%, 37.5%, 40% and 5% respectively. Yield increase may be due to a large number of mountain loess oxide and aluminum oxide, phosphate fertilizer has a strong role in fixing, so that most of the soil into a state of insoluble phosphorus. Under such conditions, the application of phosphate fertilizer, and the use of cast method, is effective.