%A FENG Ke-Yun, WANG Ning, NAN Hong-Yu, GAO Jian-Gang %T Effects of chemical fertilizer reduction with organic fertilizer application under water deficit on photosynthetic characteristics and yield of cotton %0 Journal Article %D 2021 %J Acta Agronomica Sinica %R 10.3724/SP.J.1006.2021.04077 %P 125-137 %V 47 %N 1 %U {https://zwxb.chinacrops.org/CN/abstract/article_7028.shtml} %8 2021-01-12 %X

Fixed position experiments were conducted in 2017 and 2018, and split plot arrangement with the main treatment for full irrigation (W1) with irrigation amount was 4800 cubic meters per hectare and deficit irrigation (W2) was 2400 cubic meters per hectare, and the secondary treatment including treatments without fertilization (CK), single application of chemical fertilizer (CF), 75% chemical fertilizer with 25% organic fertilizer (M1), 50% chemical fertilizer with 50% organic fertilizer (M2), and 25% chemical fertilizer with 75% organic fertilizer (M3). The effects of chemical fertilizer reduction and organic fertilizer application on photosynthetic characteristics and yield of cotton were studied to provide theoretical basis for rational utilization of organic fertilizer and reduction of chemical fertilizer input under water deficit. Under deficit irrigation, leaf area index (LAI), net photosynthetic rate (Pn), stomatal conductance (Gs), above-ground dry matter accumulation and seed yield of cotton were all lower than that under full irrigation, while irrigation water productivity (IWP) and intercellular CO2 concentration (Ci) were higher. The chemical fertilizer reduction combined with application of organic fertilizer could effectively improve the LAI after the full squaring stage, improve Pn and Gs of cotton in all stage, promote the accumulation of vegetative and reproductive organs dry matter, improve its transfer to the reproductive organs, improve the IWP and seed yield, and also increase the moisture content of soil surface in the period of full boll stage and boll opening stage. The effects among different organic fertilizer treatments on LAI, Pn and seed yield were all presented as M1 > M2 > M3, and under the treatment of M1, the average seed cotton yield of two years increased compared with CF and CK by 6.9% and 62.1% respectively. Whereas, the effects under deficit irrigation were presented as M2 > M1 > M3, and the two years’ average seed yield increased by 19.9% and 79.3% respectively compared with CF and CK under M2. Chemical fertilizer reduction and organic fertilizer application were beneficial to increase the yield of seed cotton under water deficit, and alleviate the influence of water deficit on cotton growth and development, M2 (50% fertilizer +50% organic fertilizer) was the best treatment.