龙眼磷素营养诊断技术的研究

Research of the technique on the nutrition diagnosis of phosphorus applied in longan trees

应用果园调查与大田磷肥施用试验相结合的方法 ,对龙眼磷素营养诊断技术进行了研究。结果表明 :土壤磷素诊断形态为速效磷 (Olsen法 ) ,其诊断指标 (mg/ kg)为 :>43 .89,丰富 ;1 7.5 7～ 43 .89,高 ;7.91～ 1 7.5 7,中 ;5 .0 0～ 7.91 ,低 ;<5 .0 0 ,极低。龙眼植株磷素营养诊断最佳诊断时期为 1月 ,最佳诊断部位为老熟秋梢第 2位叶 ,诊断形态为全磷 ,其诊断指标 (P% )为 :>0 .1 65 ,过剩 ;0 .1 2 4～ 0 .1 65 ,高 ;0 .1 0 9～ 0 .1 2 4,中 ;0 .0 80～ 0 .1 0 9,低 ;<0 .0 80 。

A technology of the phosphorus nutrition diagnosis was studied in longan trees by investigating the phosphorus nutrient and growth status of trees in orchards and that treated with phosphorus The results showed that when OlsenP was used as diagnostic form, rich, high, mid, low and extreme low diagnostic mark of soil phosphorus was >43 89, 17 57～43 89, 7 91～17 57, 5 00～7 91,<5 00 mg/kg P, respectively The best diagnostic period was in Jan , while the best phosphorus nutrition diagnostic position of plant was the 2-th leaf order of the mature branch sprouted in last autumn, and the diagnostic form was total phosphorus in the leaves The excess, high, mid, low and extreme low diagnostic mark of the plants was >0 165%,0 124～0 165%,0 109～0 124 %, 0 080～0 109%,and <0 080% P in the leaves, respectively