Effects of Different Irrigation Modes on the Growth, Physiology, Farmland Microclimate Characteristics, and Yield of Cotton in an Oasis

Abstract

In order to determine the effects of different water-saving irrigation techniques on physiological growth, farmland microclimate, and yield of cotton (Gossypium Spp.), a two-year field experiment was carried out in an oasis area of Northwest China, and three irrigation methods were tested, including on-film irrigation (T1), under-film drip irrigation (T2), and automatic irrigation (T3). The results showed that the relative humidity, plant height, leaf area, stem thick, and photosynthetic index with the T3 treatment were significantly higher than those with T2 and T1. The air and soil temperature with T3 (except seedling stage) were considerably lower than those with T2 and T1. According to the fitting and statistical analysis of each index and yield, except for air and soil temperature, the other indices were positively correlated with yield. Based on the analysis of each index, the T3 treatment had the most significant regulatory effect on cotton’s physiological growth and farmland microclimate. Compared with T1, the irrigation amounts of T2 and T3 decreased by 16.43% and 25.90%, but the yield increased by 38.96% and 46.28%, respectively. The automatic irrigation strategy showed significant advantages in water saving and yield increase, which could provide some reference for cotton drip irrigation in similarly arid areas.

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“…According to the results of many years of research performed both in Ukraine and in countries with an arid type of climate (USA, Spain, Latin American countries), increasing the lower threshold for optimal moisture content of the active soil layer from 60% the lowest moisture content to 70% the lowest moisture content, during the growing season, increases the consumption of irrigation water and energy resources by almost 42% (Sun et al, 2022;Mboyerwa et al, 2021;Vozhehova et al, 2017). Reduce the consumption of irrigation water, energy and funds allows a differentiated irrigation regime of plantings, which provides for the humidity of the active soil layer at the level of 100-80% the lowest moisture content in the growth phase of shoots and flowering, and its subsequent reduction to 10-70% the lowest moisture content during the berry growth phase and 100-65% the lowest moisture content during the ripening period of the berry crop (Lemos-Paiаo et al, 2022).…”

Bioenergetic efficiency of drip irrigation modes of grapes

“…According to the results of many years of research performed both in Ukraine and in countries with an arid type of climate (USA, Spain, Latin American countries), increasing the lower threshold for optimal moisture content of the active soil layer from 60% the lowest moisture content to 70% the lowest moisture content, during the growing season, increases the consumption of irrigation water and energy resources by almost 42% (Sun et al, 2022;Mboyerwa et al, 2021;Vozhehova et al, 2017). Reduce the consumption of irrigation water, energy and funds allows a differentiated irrigation regime of plantings, which provides for the humidity of the active soil layer at the level of 100-80% the lowest moisture content in the growth phase of shoots and flowering, and its subsequent reduction to 10-70% the lowest moisture content during the berry growth phase and 100-65% the lowest moisture content during the ripening period of the berry crop (Lemos-Paiаo et al, 2022).…”