M-DRIS在马铃薯幼苗N、P、K养分平衡诊断中的应用

M-DRIS Application in Diagnosis of N,P,K Nutrient Balance of Potato Seedlings

摘要: 通过沙培盆栽试验，以完全营养液处理为对照，应用修正诊断施肥综合法（Modified diagnosis and recommendation integrated system ，M-DRIS）对缺N处理马铃薯幼苗各采样部位N、P、K的丰缺状况进行了诊断.结果表明，N缺乏抑制马铃薯植株的生长发育;缺N处理中N含量有所下降，而P、K含量增加;养分非平衡指数（Nutrient imbalance index，NII）：地上茎＞叶＞块茎＞叶片＞叶柄＞地下部，地上茎中养分最不平衡，地下部较适宜;缺N处理马铃薯幼苗的需肥顺序是：N＞K＞P.

Abstract: Through the sand culture pot experiment，using complete solution as the control, modified diagnosis and recommendation integrated system （M-DRIS） was used to diagnose the N,P,K sufficiency in different parts of N deficiency potato. The results showed that nitrogen deficiency would inhibit the growth of potato. The nutrient content of N was lower than CK(complete solution) while the nutrient content of P,K were higher. Nutrient imbalance index (NII): aerial stem＞leaf＞the petiole＞leaf blades＞tuber＞underground portion. The nutrient content of aerial stem was the most imbalanced part, while underground portion nutrient content was in a proper range. The order of nutrient requirements by potato seedlings was N＞K＞P under the condition of N deficiency.