长期定位施肥条件下设施番茄连作土壤速效养分含量的动态变化

The Dynamic Changes of Soil Available Nutrient Contents of Installation Potatoes under Conditions of Long-term Positioning Fertilization

研究长期施用有机肥、化肥、有机肥与化肥配合施用及番茄不同生育期土壤碱解氮、速效磷、速效钾含量的动态变化。试验结果表明:长期施用有机肥可以提高土壤中速效养分的含量;当有机肥和无机肥配合施用时,其促进作用明显大于单施化肥;土壤速效养分的含量随番茄生育期变化较明显,番茄旺盛生长期土壤速效养分含量较高,几乎都在开花期达到最高水平,而在定植施肥前期和拉秧期含量都较低。

The dynamic changes were studied in soil alkali-hydrolysable nitrogen, rapidly available phosphorus, and rapidly available potassium under the condition of long term application of organic fertilizers, application of fertilizers, and application of mixture of organic fertilizers and fertilizers as well as changes at various stages of tomato growth. The results show that long term application of organic fertilizers can improve the content of soil readily available nutrients, when organic fertilizers and inorganic fertilizers are combined together, the effect is more obvious that that of application of fertilizers only, there is an evident change in the content of soil readily available nutrients at various stage of tomato growth, the content of soil readily available nutrients is of relatively high level at the stage of vigorous growth and it reaches the highest level at flowering period while the content is of a low level before giving positioning fertilization or at the stage of uprooting.