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小型田间试验结果表明:甘蓝对氮肥的利用系数约为70％,番茄约为20％～50％,黄瓜约为30％,马铃薯约为40％。肥料中氮的平衡也取决于植物的氮素营养水平。单施无机氮肥,或在有机肥的肥底上增施无机氮肥,在不同施肥水平下的蔬菜作物的氮素平衡问题,在文献中尚未报导过。本试验旨在研究蔬菜和马铃薯的氮素平衡问题,既研究氮肥的当季肥效,也研究氮肥不同用量的后效。1981～1984年在有灌溉条件的中度粘性灰化黑钙土上用~(15)N标志法对早熟的番茄、黄瓜、胡萝卜、莴苣和马铃薯进行大田试验和盆栽试验。
The results of field experiments showed that the utilization coefficient of cabbage was about 70% for nitrogen fertilizer, about 20% -50% for tomato, about 30% for cucumber and about 40% for potato. The balance of nitrogen in fertilizers also depends on the nitrogen level of the plant. Application of inorganic nitrogen fertilizer, or organic fertilizer on the fertilization of inorganic nitrogen, vegetable fertilizers at different levels of nitrogen balance, has not been reported in the literature. The purpose of this study is to study the nitrogen balance of vegetables and potatoes, not only to study the seasonal fertilizer effect of nitrogen fertilizer, but also to study the different effects of nitrogen fertilizer after use. Field experiment and pot experiment on early maturing tomato, cucumber, carrot, lettuce and potato with ~ (15) N marking method were carried out on medium viscous ashes calcified black earth with irrigation condition from 1981 to 1984.