摘要
水培和田间取样分析研究结果表明：培养液含Ｍｇ￣（２＋）≥４μｇ／ｍＬ，水稻生长正常；２μＬｇ／ｍＬ为缺镁，生长受抑，减产１２．６８％；无镁（ＣＫ）则中途死亡。分蘖期无镁和缺镁水稻叶绿素含量分别下降９２．４％和３６．７％，光合速率下降３７．５％和２０．６％，水稻根、茎、叶及不同叶位叶的含镁量与供镁浓度都呈良好的正相关，作为诊断其适宜部位是下位叶．以水稻地上部含镁量（拔节期）与生长量求得的缺镁“临界浓度（临界值）”为Ｍｇ０．１１％左右。
It was indicated by water culture and field sample analysis that when Mg concentra-tion in the water solution was equal to or higher than 4μg/ml the rice plant grew well. When low-er than 2μg/ml,rice growth was inhibited and the yield was significantly decreased.At tering stage,the content of chlorophyll and the rate of photosynthesis in the leaves of rice plant grown in cultural solution non-added and added low concentration Mg(2μg/ml)were decreased 92.4%,36.7%, 37.5%and 20.6%, respectively. The Mg content in root,stem or leaves was significantly correlated with Mg concentration in the culture solution. However,the lower leaf of rice plant was considered as a proper organ for Mg diagnosis. Mg content of 0.11%in the top parts of rice was recommended as a critical level at jointing stage.
基金
浙江省自然科学基金
关键词
水稻
缺镁
生理代谢
诊断指标
rice
magnesium deficiency
physiological metabolism
diagnostic index
