巨桉叶片营养DRIS诊断研究

On Leaf Nutrition DRIS Diagnosis of Eucalyptus grandis

对巨桉叶片营养诊断的采样时间、诊断指标进行研究,结果表明:巨桉适宜的叶片诊断采样时间为24月龄,采用P/N、N/K、P/K作为诊断指标,得出N∶P∶K的适宜值为1∶0 064～0 067∶0 363～0 366。需肥顺序为:第三年为P>K>N,第四年为K>N=P。

Sampling time and diagnosis index were studied on Eucalyptus grandis leaf nutrition. The results are as follows: proper sampling time of Eucalyptus grandis leaf is 24th month; P/N, N/K, P/K are regauded as diagnosis index; and proper contrast of N∶P∶K is 1∶0.064～0.067∶0.363～0.366; Nutrition need sequence is: The third year is P>K>N, the fourth year is K>N=P.