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NO₃、NH₄和尿素的不同比例对基质培番茄生长的影响（英文）

Effects of Ratios of NO₃, NH₄ and Urea on Tomato Growth in Substrate

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【Author】 FU Zhijian~1, JINZhiyu~1 and ZHANG Dewei~2 ~1 Institute for Application of Atomic Energy;~2 Institute of Horticulture; Zhejiang Academy of Agricultural Sciences, Hangzhou 310021, China

【机构】浙江省农业科学院原子能利用研究所；园艺研究所杭州 310021；

【摘要】 <正> Introduction Nitrogen is one of the main elements in the nutrient solution. In general plants are able to absorp and metabolize both NO₃ and NH₄, but NO₃ should be the main nitrogen form used in the nutrient solution because high level of NH₄ will cause NH₄ toxicity, resulting in lower tissue Ca and Mg concentration, incidence of blossom-end rot（BER）. Many studies indicate that the growth of vegetables supplied with NO₃+NH₄ was更多还原