Effects of increasing organic fertilizer on the quality of sandy soil in Hexi Corridor and the growth of Beibei pumpkin
In order to improve the quality of sandy soil in Hexi Corridor and explore the effect of organic fertilizer on the yield increase of Beibei pumpkin,Lishu No.5 Beibei pumpkin was used as the experimental material.Six treatments were set up to replace chemical fertilizer N with organic fertilizer N,and the total amount of nitrogen,phosphorus and potassium was consistent.The effects of organic fertilizer on soil nutrient content,soil microbial quantity,photosynthesis,yield and quality of Beibei pumpkin were studied.The results showed that the high ratio of organic fertilizer could signifi-cantly increase the content of soil organic matter compared with 100%chemical fertilizer treatment,and the average con-tent of organic matter in the whole growth period of beibei pumpkin was the highest in T5 treatment,which was 8.36%-36.18%higher than other treatments.Compared with the application of 100%chemical fertilizer and 100%organic fertilizer,the suitable organic and inorganic fertilizer application can significantly increase the soil total nitrogen content,and the corresponding soil bacteria,fungi and actinomycetes change curve is more gentle in the whole growth period of pumpkin.At seedling stage and vine stage,the content of available phosphorus and available potassium in soil was the lowest with 100%organic fertilizer.The content of available phosphorus in T5 was the lowest at fruit-setting stage and maturity stage,and the content of available potassium in T4 was the lowest at fruit-setting stage and maturity stage.The average single fruit mass,fruit transverse diameter and yield of T5 treatment were the highest,which increased by 4.82%-46.68%compared with other treatments.The dry matter content in fruit increased with the increase of organic fer-tilizer application.Compared with the single application of chemical fertilizer,the application of a certain amount of or-ganic fertilizer can effectively improve the vitamin C content and soluble sugar content of pumpkin.In conclusion,T5 treatment had the best comprehensive performance.
Beibei pumpkinOrganic fertilizerNutrient content in sandy soilMicrobial quantityGrowth characteris-ticsYield and quality