The Influence for Water and Nitrogenous Fertilizer Interaction on Quality,Yield and Absorption and Utilization of Nitrogen for Facility-cultivated Watermelon in Yellow River Irrigation Area of Ningxia
In order to screen out suitable water and nitrogen combinations for watermelons in Yellow River irri-gation area of Ningxia,different water and nitrogen treatments were designed to study the effects of water and nitro-gen interaction on SPAD value of watermelon leaves,fruit quality,yield and nitrogen uptake and utilization.The re-sults showed that SPAD values were higher by W1N4,W2N3,W2N4,W3N3 and W3N4 treatment,the quality was better under nitrogenous fertilizer amounts at N2 and N3.The yield was the highest under W3N4 treatment,reaching 76 565.36 kg/ha and increased by 8.34％to 37.57％compared with other treatments significantly.Followed by W3N2 and W3N3 treatment.Compared with other levels,when the irrigation water level was W1,the water use effi-ciency of facility watermelon irrigation was higher.Among them,the irrigation water use efficiency of W1N3 and W1N4 treatment was higher,reaching 43.91,45.32 kg/ha respectively,while it was significantly increased by 14.00％to 56.40％from other treatments.Fruit nitrogen accumulation and total nitrogen accumulation under W3N4 treatment were all the highest compared with other treatments significantly,increasing by 22.75％to 192.36％and 17.00％to 123.39％respectively compared with the other treatments.Partial factor productivity of nitrogen and nitrogen fertilizer utilization rate under W3N2 treatment were all the highest compared with other treat-ments significantly.Partial factor productivity of nitrogen increased by 11.00％to 343.68％separately compared with the other treatments and nitrogen fertilizer utilization rate increased by 3.34 to 10.02 percentage points com-pared with other treatments.The correlation analysis showed that SPAD,the center of soluble solids,Vc,yield,irri-gation water use efficiency and nitrogen accumulation,were all significantly positively correlated with each other,and they were significantly negatively correlated with partial factor productivity of nitrogen and nitrogen use efficien-cy,the edge of soluble solids was positively correlated with nitrogen accumulation of the plants,and negatively corre-lated with partial factor productivity of nitrogen and nitrogen use efficiency.To sum up,the watermelon had better quality when nitrogenous fertilizer amounts were N2(80 kg/ha)and N3(160 kg/ha),the yield-increasing effect was the best under the combination of water amount for W3(2 200 m3/ha)and nitrogenous fertilizer amount for N4(240 kg/ha).The interaction between high amount of irrigation water and nitrogenous fertilizer application is bene-ficial to the nitrogen absorption in watermelon,and the interaction between low nitrogen application amount and high nitrogenous fertilizer amount is conducive to utilization of nitrogen fertilizer.
Facility-cultivated watermelonQualityYieldNitrogenWater use efficiency
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