Abstract

Nutritional management in saline conditions can offend the stressful effect of salinity by increasing the amount of nutrients availability, especially nitrogen (N). To investigate the effects of foliar application of different types of N fertilizers as a supplement at the beginning of boll development stage, a randomized complete block design in three replications was carried out at the Islamic Azad University, Sabzevar Branch, during two consecutive years of 2018 and 2019. The studied factors were control, urea (recommended –50%, recommended, and recommended + 50%), and azoteam (recommended –50%, recommended, and recommended + 50%). The recommended dose for urea and azoteam was 1% v/v and 1 l/ha, respectively. The results showed that the responses of cotton yield and yield components to the type of supplemental fertilizer were significant. Different amounts of foliar application had a significant effect on yield and yield components, as well as different N efficiency specs. The supplemental foliar application with the recommended + 50% caused 48.7% improvements in plant height, 65.6% in the number of bolls per plant, 32.3% in boll weight, 52.4% in lint yield, 61.7% in seed cotton yield, 54.9% in seed yield, 19.5% in agronomic N use efficiency, and 17.4% in N uptake efficiency and reductions of 11.6% in lint percentage and 17.4% in N use efficiency. In most of the studied traits, there was no difference between the recommended and recommended + 50%. Overall, the results of this experiment revealed that under saline conditions, the recommended dose of urea spray in the early stages of development of the boll produced a good seed cotton yield.

摘要

盐水条件下的营养管理可以通过增加营养物质的供应量，尤其是氮 (N) 的数量来抵消盐度的压力影响。为了研究在棉铃发育初期叶面喷施不同类型氮肥作为补充剂的效果，2018 年连续两年在伊斯兰阿扎德大学 Sabzevar 分校进行了三个重复的随机完整区组设计和 2019 年。研究的因素是对照、尿素（推荐 –50%、推荐和推荐 + 50%）和偶氮组（推荐 –50%、推荐和推荐 + 50%）。尿素和偶氮组的推荐剂量分别为 1% v/v 和 1 l/ha。结果表明，棉花产量和产量构成对补肥类型的响应显着。不同量的叶面喷施对产量和产量构成以及不同的氮效率规格有显着影响。叶面喷施推荐量 + 50% 使株高提高 48.7%，单株铃数提高 65.6%，铃重提高 32.3%，皮棉产量提高 52.4%，籽棉产量提高 61.7%，单株产量提高 54.9%种子产量，农艺氮利用效率提高 19.5%，氮吸收效率提高 17.4%，皮棉百分比降低 11.6%，氮利用效率降低 17.4%。在大多数研究的性状中，推荐值和推荐值 + 50% 之间没有差异。总体而言，本试验结果表明，在盐碱条件下，在棉铃发育早期推荐剂量的尿素喷雾产生了良好的籽棉产量。