Effects of Water and Nitrogen Coupling on the Growth of Watermelon during Maturity in Hexi Region
In order to explore the effects of water and nitrogen coupling on the late stage of growth of watermelon in Hexi region of Gansu Province,Xiyan 8 was used as test material,a field split-plot experiment was conducted with 3 main treatments of 80%,65%and 50%field capacities,and 4 secondary treatments of N 0 kg/ha,N 100 kg/ha,N 200 kg/ha and N 300 kg/ha nitrogen application rates,and a total of 12 treatments were set up.The amount of wound fluid,soluble protein content(SP),glutamine synthetase(GS),nitrate reductase(NR),catalase(CAT),peroxidase(POD),root dehydrogenase activity and growth status were detected.The results showed that 80%field capacity+N 200 kg/ha had the highest fluid volume(32.04 mg/h)and SP content(4.62 mg/g).Water and nitrogen significantly affected the root dehydrogenase activity of watermelon,and 65%field capacity treatment was the highest with an average of 84.06 μg/(g·h).GS,NR and root activity increased firstly and then decreased with the increase of irrigation amount in N 100 kg/ha and N 200 kg/ha treatments and were both peaked at 65%field capacity.The overall evaluation showed that 65%field capacity+N 200 kg/ha treatments had highest scores of comprehensive evaluation of watermelon growth at maturity stage(0.72),the growth of watermelon in this treatment group was the best at the late stage,which was suitable for Xiyan 8 watermelon cultivation in Hexi region.
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