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根外追肥虽属辅助性追肥,但它具有成本低、见效快和方法简便等特点,因而在棉花生产上被广泛应用。目前在生产实践上,主要有如下几种用法。1、苗床接力,育苗期间,棉苗出现缺肥症状时,若采用土壤追肥,需结合灌水,往往提高土壤湿度,导致菌病加重;同时土
Although the root top dressing is an auxiliary top dressing, but it has the characteristics of low cost, quick response and simple method, so it is widely used in cotton production. Currently in production practice, there are several main usage. 1, seedbed relay, nursery period, cotton seedlings appear lack of fertilizer symptoms, if the use of soil top dressing, combined with irrigation, often increase soil moisture, leading to aggravating mycosis; while soil