Effects of N,P,K Proportional Fertilization on Coconut Growth,Soil Physicochemical and Enzyme Activities
To determine and compare the growth indicators,soil physicochemical properties,and enzyme activity of coconut under different nitrogen phosphorus potassium ratio fertilization treatments,providing scientific basis for coconut fertiliza-tion management.The results showed that,except for stem circumference,fertilization significantly promoted coconut growth and increased most soil enzyme activities,and most growth indicators and soil enzyme activities increased with the increase of fertilization amount.When the fertilization amount is the same:the most growth indicators of Y7(N15P8K20 750 g/plant),Y5(N15P8K20 500 g/plant),and Y2(N15P8K20 250 g/plant)are higher than N7(N12P5K12 750 g/plant),N5(N12P5K12 500 g/plant),and N2(N12P5K12 250 g/plant),respectively;There was no significant difference in soil enzyme activity under the same amount but different ratios of fertilization treatment,except that the activities of sucrose enzyme and acid protease under Y7 treatment were significantly higher than those under N7 treatment,and the activities of acid protease under Y5 treatment were significantly higher than those under N5 treatment;The effective boron,exchangeable calcium,and ex-changeable magnesium contents of Y7 treatment were significantly higher than those of N7.The above results indicate that there is still room for improvement in the upper limit of coconut fertilization.Compared with the N12P5K12 treatment,the N15P8K20 treatment with higher phosphorus and potassium content is more conducive to coconut growth and improves soil nutrient status.This may be related to the nutrient status of coconut orchard soil and the nutrient requirements of coconut trees at specific periods.To develop precise and scientific fertilization strategies,it is necessary to conduct research on the nutrient status of coconut orchard soil and the nutrient requirements of coconuts at different growth stages in the future.
coconutproportional fertilizationroot activitysoil physical and chemical propertiessoil enzyme activities
万方数据
维普
