Effect Of Nitrogen Exponential Fertilization Treatment On Melon Growth And The Nutrient Loading

In recent years,Xinjiang’s facility melon planting area has reached 700,000 mu,which is the main production area of melon in China.But most take the traditional cropping patterns fertilization of experience,a lack of precision management techniques,resulting in a series of questions fertilizer waste,soil salinization,reduced fruit yield and quality and so on.The current exponential fertilization technology has been widely used in the research of forest trees.In order to explore its role and applicability in the production of melons,this experiment used the"BAI SHAMI"melon as the test material,yellow sand:slag=5:4 as the cultivation substrate,and studied the non-fertilization treatment CK and exponential fertilization treatment(E2,E4,E6,E8,E10),the effect of average fertilization treatments(C2,C4,C6,C8)on the growth,yield,quality and nutrient carrying capacity of melon.To find a more reasonable and fertilizer application methods to reduce fertilizer waste and soil pollution,and provide new fertilization program for the cultivation and production.The results of the study are as follows:(1)The plant height,stem thickness,leaf area,dry matter accumulation and chlorophyll content of melon all increased first and then decreased with the increase of nitrogen application rate.Exponential fertilization treatment had more advantages in later growth than average fertilization treatment.The above-ground part growth and dry matter accumulation showed that exponential fertilization E6(6 g/plant)was the best treatment,The chlorophyll content is the best in the average fertilization C6(6 g/plant)treatment,while the root growth is more suitable in the low nitrogen level C4(4 g/plant)treatment.(2)Nitrogen application rate of 0-6 g/plant can increase the weight and yield of melon,the highest is274.29 g and 36575.24 kg/hm~2 for C6 treatment,which increases the yield by 13.4%compared with CK,and there is no significant difference between E6 and C6 treatment.The comprehensive evaluation of fruit yield and quality using the membership function method is the best in the E6(6 g/plant)treatment.(3)The nutrient concentration of each organ was E4(4 g/plant)and the aboveground nutrient accumulation E6(6 g/plant)had the best performance.The nutrient concentration and accumulation of nitrogen and phosphorus in each organ are shown as:fruit>leaf>stem>root,and potassium is shown as fruit>stem>leaf>root,the whole plant performance for each nutrient content K>N>P,index of fertilization treatment E4(4 g/plant)optimal performance,and the distribution of nitrogen,phosphorus,and potassium nutrients in the roots,stems,leaves and fruits of the melon plant inclined to the leaves and fruits with the increase of nitrogen application rate.Under the treatment of exponential fertilization E6(6 g/plant),the fruit nitrogen absorption could reach 107.88 kg/hm~2,the NHI:68.16%,the NRE:21.43%,NAE:9.65 kg/kg,and NPE:46.29 kg/kg.Compared with average fertilization,exponential fertilization can more effectively promote the nutrient carrying capacity of N,P and K,and can achieve higher N absorption and utilization efficiency with lower N application rate.Exponential fertilization E6(6 g/plant)treatment has good performance in terms of growth,yiel d,quality and nutrient loading capacity,which is suitable for actual production.