Effects of Different Rates of Nitrogen and Potassium on Nutrient Levels in Tomato and Soil

'Liaoyuanduoli' tomato was planted in the pot of greenhouse.The effects of different N and K treatments on tomato nutrition,dry matter accumulation,fruit yield,quality and the change of soil nutrients were studied.The results showed that the N and K ratio in the leaves and fruits of tomato increased with the application of N and K in the soil.Within a certain limit,the content of N and K in the leaves and fruits of tomato improved with increasing N and K fertilizer in the soil.It indicated that N and K elements can advance adsorption for each other.But the N and K percent in fruits decreased beyond some extent.It had little influence on P absorption for plant under different N and K treatments.The absorption of Mg and Ca in the tomato would be restrained to some extent when K fertilizer of soil increased.The content of N in the soil had little influence on Ca absorption in the leaves.Suitable N in soil accelerated the absorption and accumulation of Mg in the leaves and fruits.But excessive N decreased the accumulation of Ca and Mg.The content of available N and K increased with the ascension of N and K fertilizer in the soil.The treatment,which had moderate K level,had a high available N content in soil under different K treatments in the soil.