Effects of Foliar Spraying of Potassium Dihydrogen Phosphate on Agronomic Traits,Yield and Quality of Cotton
In order to verify the effects of spraying potassium dihydrogen phosphate(KAP)on cotton at different fertility periods,the effects of spraying KAP at bud,flower and boll stage on the agronomic traits,yield,quality and economic efficiency of cotton were investigated.Five treatments of nitrogen were set,they were:phosphorus and potassium fertilizer(NPK),potassium phosphate(PL)sprayed at bud stage,potassium phosphate(PH)sprayed at flowering stage,potassium phosphate(Pl)sprayed at boll stage and potassium phosphate(PLHl)sprayed at bud stage.The agronomic traits,yield,quality,and eco-nomic benefits of cotton plants at different growth stages were measured.At anthesis,cotton plant height was significantly higher in PLHl treatment than in NPK treatment.At the boll stage,the stem thickness of PH,Pl,and PLHl-treated cotton was significantly higher than that of NPK and PL treatments;Spraying po-tassium dihydrogen phosphate at the flowering stage increased the number of bolls per plant,and signifi-cantly increased the weight of bolls per boll at the boll stage;and the average length of the upper half of the cotton in PLHl-treated cotton,the ratio of strength to break,the degree of regularity,and the elongation were significantly higher than that in the other treatments.Spraying of potassium dihydrogen phosphate in-creased the economic benefits of cotton,and the PLHl treatment increased the economic benefit,to the high-est level of 4419.78 yuan/hm2.According to the growth of cotton,spraying potassium dihydrogen phos-phate(KAP)at flowering and boll stage can increase the weight of cotton bolls and the number of bolls per plant,thus achieving the effect of increasing yield.
cottonpotassium dihydrogen phosphatephosphorus fertilizerutilization ratesingle bell weightoutput
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