Chinese Journal of Applied Ecology
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LIU Zhao-fan1, ZHANG Guo-bin1, YU Ji-hua1, YANG Hai-xing2, SHI Gui-ying1, MA Yan-xia1, LI Jie1
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Abstract: A field experiment was conducted to study the effects of different nitrogen forms ((NH2)2CON, NO3--N, NH4+-N, and NO3--NH4+) and their ratios on the yield formation, quality, and nutrient (N, P, and K) absorption of broccoli (Brassica oleracea). Fertilization with NO3--N increased the accumulation of nitrate and soluble sugars in ball flower. When the NO3--N:NH4+-N ratio was ranged from 3:7 to 5:5 and from 5:5 to 7:3, respectively, the accumulation of nitrate in the ball flower was reduced, while the soluble sugars content was promoted. Fertilization with (NH2)2CON and NH4+-N was conducive to the improvement of Vc content in the ball flower. N fertilization increased the accumulation of N, P, and K in plants, with the highest contents of N, P, and K observed at rosette stage. Throughout the entire growth period, NH4+-N fertilization improved the plant N content, whereas NO3--N fertilization improved the plant K content. At different growth stages, the effects of different N sources on plant P content varied. As compared with applying single N forms, the NO3--N:NH4+-N ratio ranged from 3:7 to 5:5 could improve the yield significantly. It was suggested that a combined application of NO3--N and NH4+-N with an appropriate ratio could improve the productivity, quality, and economic return of broccoli.
LIU Zhao-fan1, ZHANG Guo-bin1, YU Ji-hua1, YANG Hai-xing2, SHI Gui-ying1, MA Yan-xia1, LI Jie1. Effects of different nitrogen forms and their ratios on broccoli yield, quality, and nutrient absorption.[J]. Chinese Journal of Applied Ecology.
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URL: https://www.cjae.net/EN/abstract/abstract10802.shtml
https://www.cjae.net/EN/Y2013/V24/I7/1923