Effect of different combination of organic and inorganic potassium on the yield,quality and soil regime of lettuce

doi:10.14088/j.cnki.issn0439-8114.2020.17.011

Abstract

Abstract: In order to clarify the optimum proportion of organic and inorganic potassium fertilizer on lettuce （Lactucas sativa L. var. ramosa Hort.）, the effects of different combination of organic and inorganic potassium on the yield, quality of lettuce, the content of soil microorganisms and soil enzyme activity in Wuhan were studied. The results showed that the application of potassium fertilizer promoted the increase of leaves, SPAD value, photosynthetic rate and transpiration rate, decreased the content of nitrate and increased soluble sugar in the leaves, and significantly increased the yield, potassium content and potassium accumulation of lettuce, and also increased the activities of urease, phosphatase and invertase in the rhizosphere of lettuce after harvest, and the number of bacteria and fungi that could be cultured in the soil. Under the condition of equal potassium application, the application of organic fertilizer could reduce the accumulation of nitrate in leaves, reduce the content of VC in leaves and increase the content of soluble sugar. The yield of lettuce, accumulation of potassium, apparent utilization rate and agronomic efficiency of potassium fertilizer with the ratio of organic and inorganic potassium of 3∶7 and 1∶1 were all higher than other potassium treatments, and the activity of urease and phosphatase in the soil with the ratio of 1∶1 was also higher.Analysis indicated that the application of organic and inorganic potash fertilizer could improve the yield, quality, fertilizer utilization rate and soil enzyme activity of lettuce, and the effect of organic and inorganic potash fertilizer was better than that of all chemical fertilizers. The ratio of 3∶7 or 1∶1 of organic and inorganic potash fertilizer had better effect.

Key words: lettuce（Lactucas sativa L. var. ramosa Hort. ）, yield, quality, soil regime, organic potassium fertilizer, inorganic potassium fertilizer, combination application

CLC Number:

WANG Su-ping, DU Lei, HONG Juan, HUANG Xiang, ZHANG Gui-you, ZHANG Li-hong, LIAN Zhi-cheng, YE Li-xia, JIANG Li, CHEN Gang. Effect of different combination of organic and inorganic potassium on the yield,quality and soil regime of lettuce[J]. HUBEI AGRICULTURAL SCIENCES, 2020, 59(17): 49-53.

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