沙漠边缘地区枣树早期产量和生长量与密度、施肥量关系研究

Study on the Relation Between Early Yleld、 Increment of Zizyphus jujuba and the planting Density、 Quantity of Fertilizer on the Edge of Desert

对枣树早期栽培采用了不同密度、施肥量，研究其与生长量、产量的关系。结果表明，在沙漠边缘地区，采用密植栽培、增大施肥量是实现枣树早期丰产和显著提高经济效益的有效途径。密植栽培第５年，平均每公顷产鲜枣６１９０ｋｇ，最高可达１１８００ｋｇ。早期适宜密度为每公顷３３３３～６６６７株；较适宜的施肥量为２年生枣树，株施纯磷２０～２７ｇ，纯氮４０～４５ｇ；３年生枣树，株施纯磷４０～５０ｇ，纯氮８１～１１０ｇ；４至５年生枣树，株施纯磷６１～９１ｇ，纯氮１３２～１８２ｇ。

This test has studied the relations of early yield、 increment of Ziayphus jujuba and different planting densities、 different quantities of fertilizer in itsearly planting. The study results show that it is a efficient way to attain early abundant yield and to enhance economic effect by increasing quantity of fertilizer.It was five years after dense planting that yield of green fruits attained 6 190 kg/ha. maxium yield attainef 11 800 kg/ha.Early rational density of planting was 3 333～6 667 trees 1 ha. Rational quantites of fertilizer as follows; A tree aged two years needs 20～27 grams P and 40～45 grams N. A tree aged three years needs 40～50 grams P and 81～110 grams N. A tree aged four to five years needs 61～91 grams P and 132～182 grams N.