摘要
氮钙对番茄生育和诱发脐腐病的研究表明:Ca^(2+)浓度与诱发脐腐病关系密切。当营养液中Ca^(2+)浓度大于6m mol/L时。即N/Ca值由0.75～4.5[(9/12～27m mol/L)/(6m mol/L)],脐腐病发病率很低;当Ca^(2+)浓度小于5m mol/L时,则患病率迅速增加。患脐腐病的直接原因是供应番茄果实营养的相应功能叶中Ca^(2+)供应不足,即缺钙所引起的一种生理性病害。此外,钙对降低功能叶中有机酸的含量,增加还原态Vc的积累也起积极的作用。
Soilless culture with different combinations of N-Ca solution was carried out to study the effects on the development of tomato and its blossom-end rot disease.
The result showed that no blossom-end rot took place when Ca concentration was greater than 6m mol N/L i. e. , N/Ca ratio was between 0. 75 to 4. 5 (9/12～27m mol . L^(-1)/6m mol . L^(-1)); While the proportion of diseased plants increased rapidly when the Ca concentration was llower than 5m mol/L.
The real reason for causing the disease may be more related to the low Ca providing capacity of the functional leaves than the low Ca concentration in the fruits.
In addition, the contents of organic acids in the functional leaves may be decreased and the vitamin C increased by the effect of higher Ca concentration.
出处
《上海农业学报》
CSCD
1992年第4期48-52,共5页
Acta Agriculturae Shanghai
基金
国家自然科学基金
关键词
番茄
脐腐病
硝态氮
水溶性钙
Tomato, Blossom-end rot disease, Nitrate-N, Water soluble calcium
