荔枝秋梢的营养状况研究

本研究通过了解荔枝秋梢叶片中Ｎ、Ｐ、Ｋ大量元素的水平高低 ,动态变化与种植地点、品种、季节变化的关系 ,提出合理施用Ｎ、Ｐ、Ｋ的配比及依据 .1　材料与方法从 1 990年开始 ,在广东省内东莞大岭山 (山地赤壤 )、广州钟落潭 (水田红砂壤 )、从化街口(坡地红壤 ) 3个点 ,每个点各选用 1 0株生长相对一致的 1 5- 2 5年生淮枝和糯米糍荔枝做试材 .在选用的同树龄、同品种树上进行秋梢叶片观察和取样测试 ,以平均分配方位法于每树冠取 50片叶 ,每点 1 0株共取 50 0片叶混合粉碎后测定其Ｎ(蒸溜滴定法 )、Ｐ(钒钼黄比色法 )、Ｋ(四苯硼钠重量…

STUDY ON THE PHYSIOLOGY OF NUTRITION IN AUTUMN SHOOTS OF LITCHI

The research results in last 10 years showed that the contents of the macro-elements in autumn shoots of Litchi decreased in the order of N, K and P, which was not related to environment and variety, but notably to season. The contents of P and K in leaves of autumn shoots decreased rapidly, but the content of N did not change at the flowering and fruit bearing stages. The autumn shoots developed into fruit branches, and Litchi yield was significantly correlated to contentsof N, P and K in leaves of autumn shoots; Litchi yield was significantly correlated to the content of N and P at the flowing stage, it was significantly correlated to the content of K at the maturity stage. Rreasonable ratio among N, P and K was one of important measures to achieve high and stable yield in Litchi.