Effect Of The Tablet Fertilizer Of Potassium Sulfate Or Ammonium Sulfate On Soil Environment In Apple Root-Area And The Growth Of Young Trees

The rate of nutrient releases has an important effect on the loss of fertilizer,utilization efficiency and nutritional effect.Potassium ions are highly mobile in the soil,ammonium ions are prone to ammonia gas after volatilization,they are more easily lost nutrients.Potassium sulfate and ammonium sulfate are commonly used fertilizers in fruit tree production,and this study makes them into potassium sulfate/ammonium tablet fertilizers with modified apple waste chips and other tablets,and is applied to the potted ’Red Fuji/Pinyin Sweet Tea’ apple(Malus domestica Borkh.cv.Red Fuji/Malus hupehensis var.pingyiensis.)The young trees investigated the effective nutrient content of the soil,soil micro-organisms and soil enzyme activity and apple growth in the root area,and the results showed that:1.The mixing of modified apple waste branches,biochar and pyridine resin glue in potassium sulfate/ammonium powder was successfully prepared with 60%,63% and 65%tablet fertilizer,respectively.The time required for the full release of potassium in 60% and63% potassium sulfate tablet fertilizer in water was 240 h,312h and 216 h,60%,63% and 65%ammonium sulfate tablets for the full release of nitrogen in water time of 264 h,288h and336 h,respectively;The nutrients in potassium sulfate and ammonium sulfate were fully released in water at less than 3h.2.Compare with the application of the same amount of potassium sulfate,the application of 60%,63% and 65% potassium sulfate tablet fertilizer significantly promotes the growth of apple larvae,improves the photosynthesis rate of leaves,significantly improves on root system vitality,promotes root system growth,improves on root system,and significantly increases the soil fast-acting potassium content,pyrethoryase and sucrose activity enzyme,soil microbial quantity.Among them,63% potassium sulfate tablet fertilizer had better effect on the root system,which increased the root system vitality,the total length of the rootsystem,the surface area of the root system,the root volume and the root tip count by 43.55 percent,97 percent,85 percent,197.23 percent and 135.36 percent,respectively.3.Compare with the application of the same amount of ammonium sulfate,60%,63%and 65% ammonium sulfate tablet fertilizer can significantly improve soil acidity,significantly increase soil pyrethroid and sucrose enzyme activity,soil alkali nitrogen de-nitrogen content,significantly increase the number of bacteria,fungi,line-release bacteria and the total number of microorganisms in the soil,significantly promote the growth of apple leaves,improve the chlorophyll content,clean light integration rate,steaming rate and other nutrients.Of these,65% ammonium sulfate tablet fertilizer had better effect on soil effective nutrient content,which increased the nitrogen content of soil alkali,sucrose enzyme and cels activity by 16.8%,34.4% and 58.9%,respectively.