寒地水稻氮磷钾营养诊断技术的研究

Studies on the Technique of Rice Nutritional Diagnosis in Cold Region of Northeast China

采用多点田间生物试验法,在2006—2007年对寒地水稻进行了两年营养诊断技术研究,形成了寒地水稻氮、磷、钾的土壤和植株营养诊断技术与方法。氮素诊断在分蘖期和孕穗期均以叶片叶绿素相对含量作为诊断指标最好;磷素营养诊断在分蘖期土壤全磷和植株全磷均可作为诊断指标,在孕穗期以植株全磷为诊断指标最好;钾素诊断在分蘖期土壤速效钾和植株全钾均可作为这个时期的诊断指标,在孕穗期以土壤速效钾进行钾营养诊断最能反映生产实际。

Two years studies on the technique of rice nutritional diagnosis were conducted during 2006-2007 by the method of field multi-sited experiments in cold region of northeast China. The N, P, K diagnostic technique and methods were formed in both plant and soil. For the nutrient of nitrogen, the chlorophyll content of blade was the best indicator to the nutritional state in both tillering and spike formation stage. To the nutrient of phosphorus, both plant and soil total P could be used for P nutritional diagnosis in tillering stage, but plant total P was the best one to indicate the rice phosphorus status in spike formation stage. Concerning the potassium, either soil available K or plant total K could be used in the diagnosis of tillering stage, and in spike formation stage, only the soil available K was the most suitable characteristic in the practice of K diagnosis.