施镁对缺镁葡萄叶片和果实矿质元素含量的影响

在大田条件下,对缺镁的葡萄园进行了土施和叶面喷施硫酸镁肥的试验,探讨缺镁条件下,施镁对葡萄叶片和果实矿质营养吸收的影响,为葡萄施肥提供理论依据。采用裂区试验,主区设4个土施硫酸镁梯度,分别为0、112.5、150、187.5 kg/hm2,副区设3个叶面喷施硫酸镁浓度,分别是0%、0.2%、0.4%。结果表明:土施和叶面喷施硫酸镁在增加缺镁葡萄镁含量的同时,促进了钾、钙和锰的吸收,但降低了叶片和果实中锌含量,对铁和铜的影响不显著。土施镁肥极显著增加了叶片和果实中镁含量,叶面喷施极显著增加了叶片镁含量,但对果实镁含量影响不显著;土施150 kg/hm2同时叶面喷施0.4%硫酸镁肥,可提高叶片和果实中镁及其它矿质元素的含量。

Effects of magnesium application on the mineral nutrition absorption by grapes with magnesium deficiency

Under the condition of lack of magnesium,effects of magnesium application on the mineral nutrition absorption of grape were studied to explore the relationship between magnesium application and nutrients contents of leaves and grape fruits,in order to provide reference basis for formulating rational fertilization technique of grape.A field experiment with a split plot design was conducted,four soil applying gradients of 0,112.5,150,187.5 kg/hm2 were set up in the main area,while in deputy district three concentrations of foliar spraying were set up,respectively was 0%,0.2%,0.4%,mineral element contents in leaves and fruits were measured.The results showed that magnesium supplement significantly increased the magnesium content of grape leaves and fruit,and promoted the absorption of potassium,calcium and manganese,but reduced the zinc content in the leaves and fruit,and there was no significant effect on iron and copper.When soil applying 150 kg/hm2 and foliar spraying 0.4% magnesium fertilizer,the magnesium,potassium,iron,manganese contents in the blade were appropriate,while calcium was high,zinc was in low level but could meet the need of grapes,spikelets and fruit weight were the largest.It was concluded that magnesium application under soil applying 150 kg/hm2 and foliar spraying 0.4% was the best.