旱坡地枣树密植园施肥试验

黄土丘陵区旱坡地枣树密植园施肥试验表明，施肥3次效果最好。施硝酸磷和硝铵效果极显著地高于碳铵，而硝酸磷与硝铵之间差异不显著。试验认为：旱坡地枣园实行密植栽培制度以后，对肥水条件要求更加严格，必须加大集约经营强度。连续2年压青培肥试验，枣树植株在地径、树高、冠幅、吊果比和单株产量等方面均极显著地高于对照，基本规律是：压青25kg 者优于15kg和10kg。试验表明：在水肥缺乏、肥料补充又较为困难的黄土丘陵旱坡地枣树密植园，压青培肥是促进树体生长发育、提高产量质量的一条重要途径。

Test of Fertilizer-applying in Arid Hillside Jujube Close Planting Garden

Test of fertilizer-applying in arid hillside jujube close planting garden shows that the effect of 3 times fertilizer applying is the best. Effect of phosphorus nitrate and that of ammonium nitrate is better than that of ammonium carbonate very remarkably, the difference between phosphorus nitrate and ammonium nitrate is not remarkable. The results show that after the close planting system is conducted in arid hillside jujube garden, the garden make much strict on the conditions of fertilizer and moisture. The intensity of intensive farming should be increased. Continual two years tests of green manuring show that the index of diameter at butt end, height, crown diameter, the ratio of dropping shoot in the year to fruit, and the yield per tree etc. is better than that of the check very remarkably. The basic rule is that 25 kg green manuring is better than 15 kg and 10 kg green manuring, which shows that in water and fertilizer deficient arid hillside jujube close planting garden, the green manuing is an important way of promoting plant growth and development and raising yield and quality.