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运用土壤,植株的营养诊断技术,是小麦高产不倒,省肥和低成本的行之有效的措施。小麦亩产800—1000斤的营养指标:冬前——返青期的土壤硝态氮10-20PPM,磷素10—1.5PPM,在植株中硝态氮均在500—800PPM 为宜。以后随着小麦生育进程,除植株中钾素逐渐增高外,硝态氮和磷素均有下降的趋势,达是小麦高产的正常现象,后期如硝态氮不日趋递减而钾素不逐步增加到3000PPM 以上者,通常预示后期小麦有产生倒伏危险。凡是3月下旬土壤硝态氮含量低于
The use of soil, plant nutrition diagnosis technology, wheat yield does not fall, save fertilizer and low cost effective measures. Wheat per mu 800-1000 kg of nutrition indicators: winter pre-return green soil nitrate 10-20PPM, phosphorus 10-1.5PPM, nitrate nitrogen in plants are 500-800PPM appropriate. Later, with the growth of wheat, nitrate nitrogen and phosphorus decreased in all but the plant potassium, which was a normal phenomenon of high yield of wheat. In the later stage, nitrate nitrogen did not decrease but potassium did not increase gradually To more than 3000PPM, usually indicates the late wheat has the risk of lodging. Soil nitrate nitrogen content is lower than that in late March