叶面施硒对青花菜含硒量及产量与品质的影响

采用不同浓度的Na2SeO3进行青花菜叶面喷施田间试验,研究青花菜对硒的吸收、转化特点,以及硒对青花菜产量、品质等的影响。结果表明,叶面施硒可显著提高青花菜的含硒量;青花菜总硒、有机硒、无机硒含量与施硒浓度呈正相关,同时随施硒量的增加,青花菜中有机硒的转化率不断提高,但至最高浓度(100 mg／kg)时转化率又有所降低。除硒浓度为0．1 mg／kg外,硒浓度对青花菜产量均呈负效应;另外,低浓度硒使青花菜中维生素C含量有所增加,并且一定硒浓度可提高青花菜的部分矿质营养水平。综合各因素,青花菜施硒量以不超过1．0 mg／kg为宜。

Effect of selenium on content of selenium,yield and quality of broccoli

Selenium is indispensable to human being and domestic animals and it's important component of GSH-Px. The deficiency or excess of Se in the environment has been found to be associated with a variety of diseases in humans and domestic animals. Qinghai plateau is a region short of Se. Through fertilizing selenium, it can convert inorganic selenium into a reliable, effective organic selenium and eventually enter food chain,which is an effective method to improve deficiency selenium state of human being and domestic animals. This field experiment spraying selenium on the leaves of broccoli examined the effect of Se on Se uptake and transform of broccoli,and on broccolis yield and quality. This experiment consisted of 6 treatments : O(CK), 0. 1,1. 0,10,50,100 mg/kg of Se as NaSeO3. The results showed that applying selenium of different concentrations on leaves of broccoli increased the content of selenium of broccoli significantly. Total selenium, organic selenium and inorganic selenium had a positive correlation with selenium concentrations applied. And with the increase of the dosage of selenium,the rate of transformation of organic selenium rose constantly. It also indicated that selenium in exterior application on leaves of broccoli on selenium transformation,increased the content of vitamin C and coarse fibre of broccoli,but decreased the yield. Consideration of human health has shown that the dosage of selenium under 1. 0 mg/kg is reasonable.