多元施肥对玛河流域盐碱棉田土壤肥力、植株养分及产量的影响OA

This study investigated the effects of combined application of organic fertilizer and foliar fertilizer on soil nutrients,plant nutrients,and yield in saline-alkali cotton fields within the Mahe river basin.The objective was to propose comprehensive improvement measures for enhancing soil quality and production capacity in medium-to-low-yield saline-alkali cotton fields.Saline-alkali cotton fields were selected as the research subject,and five fertilization treatments were established:no application of organic fertilizer or foliar fertilizer(T1),application of 2250 kg/hm² organic fertilizer(T2),application of 3750 kg/hm² organic fertilizer(T3),foliar application of fertilizer(T4),and combined application of organic fertilizer and foliar fertilizer(T5).Results indicated that compared to T1,treatments T3 and T5 significantly increased organic matter and alkali-hydrolyzable nitrogen content in the 0-20 cm soil layer.During the boll-opening stage,organic matter and alkali-hydrolyzable nitrogen increased by 35.43%and 39.51%,and 15.72%and 20.03%,respectively.Treatments T3 and T5 increased available phosphorus and available potassium by 9.79%and 10.01%,and 9.8%and 15.9%,respectively,during the boll-opening stage.Throughout the growing season,nutrient content in the 0-20 cm soil layer exceeded that in the 20-40 cm layer across all treatments.The combined application of organic fertilizer and foliar fertilizer significantly increased the total nitrogen content of cotton roots and the total phosphorus and potassium content of leaves during the growing season.Compared with the T1 treatment,the T3 and T5 treatments increased root nitrogen content by 23.11%and 36.4%,respectively,during the flowering stage.T4 and T5 treatments increased leaf phosphorus content by 10.81%and 15.38%,and by 7.5%and 9.17%,during the flowering and bell stages,respectively;leaf potassium content increased by 22.99%and 24.33%,respectively,during the flowering stage.The T5 treatment significantly increased both lint yield and net income from cotton cultivation in saline-alkali cotton fields,achieving increases of 13.04%and 16.21%,respectively,compared to the T1 treatment.The combined application of organic fertilizer and foliar fertilizer effectively addressed the issues of low soil nutrient content and plant nutrient deficiency in saline-alkali cotton fields.This approach significantly enhanced soil fertility,promoted nutrient uptake by cotton plants,and increased cotton yields,providing technical support for boosting production in regional medium-and low-yield cotton fields.