黄土丘陵区枣园施肥试验

根据黄土丘陵区土壤肥力特点及土体结构，选用硝酸铵和过磷酸钙作为试验肥料，进行了不同施肥量试验。结果表明，黄土丘陵区穴施磷肥的效果要比传统的施肥方法效果好，最佳施肥量为1．0kg／株～1．5kg／株；枣树对硝铵反应十分敏感，施肥量必须严格控制，黄土丘陵区硝铵的最适施肥量为0．10kg／株～0．25kg／株，过多或过少都会明显影响枣树的吊果率和产量。

Fertiliaztion Trial of Jujube Orchard in Loess Plateau

According to soil fertility and soil structure in the loess plateau,the experiment of fertilizer amount was carried out with ammonium nitrate and calcium superphosphate. The result indicated that the effect of pit application of superphosphate exceeds that of traditional way, the most suitable amount of fertilizer is 1.0kg/tree -1. 5 kg/tree- Jujube is very sensitive to ammonium nitrate,so that strict control of application is needed,the most suitable ammount of ammonium nitrate is 0.10kg/tree-0. 25kg/tree, much heavy or much less both can reduce fruit set percentage and production of jujube.