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研究了不同钾肥种类(氯化钾和硫酸钾)和施肥方式对莴笋和大白菜产量和品质的影响。研究结果表明,与常规施钾相比,各处理莴笋和大白菜产量均以分期施钾更高,第1茬莴笋氯化钾处理的增产效果显著高于硫酸钾处理,第2茬大白菜硫酸钾处理的增产效果明显高于氯化钾处理;第1茬各处理莴笋可溶性糖含量均降低,第2茬各处理大白菜维生素C含量均不同程度增加、硝酸盐含量均下降,除基施硫酸钾外其余处理均使大白菜氨基酸含量提高;第2茬各处理蔬菜全氮含量变化均不大,第1茬莴笋全磷、全钾和全氯含量均不同程度提高,除K1-3处理外,其余处理莴笋叶全硫含量均提高,硫酸钾各处理(除K2-4处理外)均使莴笋茎全硫含量提高,第2茬K1-4处理使大白菜全磷含量提高15.6%,其余处理均降低,各处理大白菜全钾含量均不同程度地提高,其中硫酸钾各处理的全钾含量明显高于氯化钾各处理;各处理两季钾素利用率以K1-4处理最高。
The effects of different types of potash fertilizer (potassium chloride and potassium sulfate) and fertilization methods on the yield and quality of lettuce and Chinese cabbage were studied. The results showed that the yield of lettuce and Chinese cabbage was higher than that of conventional potassium fertilization, the yield of lettuce and potassium chloride was higher than that of potassium sulfate treatment in the first crop, and the second crop of Chinese cabbage sulfate The yield of potassium treatment was significantly higher than that of potassium chloride treatment; soluble sugar content of lettuce in the first stubble decreased, the content of vitamin C in Chinese cabbage increased in different degrees in the second stubble, nitrate content decreased, The contents of amino acids in Chinese cabbage increased with the rest of potassium treatment. The changes of total nitrogen in vegetables in the second crop were not significant. The contents of total phosphorus, total potassium and total chlorine in the first crop increased to different extents except for K1-3 , While the content of total sulfur in lettuce leaves increased with the treatment of K2SO4 (all except K2-4), the content of total sulfur in lettuce was increased, while the K content in the second crop increased 15.6% of the total phosphorus in the Chinese cabbage The total potassium content of Chinese cabbage increased to different extents. The content of total potassium in each treatment of potassium sulfate was obviously higher than that of potassium chloride treatment. The potassium utilization rate of two treatments was the highest in K1-4 treatment.