Effects of Different Forms and Ratios of Nitrogen Fertilizer on the Growth and Development of Watermelon and Nitrogen Fertilizer Utilization Efficiency
In order to explore the effect of different forms of nitrogen fertilizer and their ratios on the production performance of watermelon,so as to provide a basis for nitrogen fertilizer selection in watermelon cultivation,Longkang 9 was selected as the experimental material.The effects of different fertilization treatments on dry matter accumulation,yield,quality and nitrogen accumulation and utilization indexes of watermelon were studied by using three nitrogen fertilizer treatments(amide nitrogen,nitrate nitrogen and ammonium nitrogen)and three ammonium nitrate ratios(70%nitrate nitrogen+30%ammonium nitrogen,50%nitrate nitrogen+50%ammonium nitrogen,30%nitrate nitrogen+70%ammonium nitrogen)with same amount of nitrogen application rate applied(N 200 kg/ha).The results showed that the effects of single nitrogen fertilizer on dry matter accumulation,yield,nitrogen accumulation and utilization of watermelon plants were nitrate nitrogen＞amide nitrogen＞ammonium nitrogen.70%nitrate nitrogen+30%ammonium nitrogen could maintain better fruit quality,and watermelon yield,economic benefit,nitrogen utilization rate and partial productivity were the highest.Compared with amide nitrogen,watermelon yield increased by 15.24%,economic income increased by 6 056 Yuan/ha,nitrogen utilization rate increased by 7.95%,and nitrogen partial productivity increased by 15.24%.Therefore,it is better to use 70%nitrate nitrogen+30%ammonium nitrogen in watermelon production at the nitrogen application level of 200 kg/ha,which is suitable for practical application.
Nitrogen fertilizer form and ratioWatermelonYieldFruit qualityNitrogen utilization rate
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