The objective of this study was to investigate the effect of a specified water deficit during a specified growth stage by replenishing root zone soil water. A field experiment was conducted with 27 treatments in randomized block design comprising groupings of different root zone soil water replenishment levels (100%, 70%, and 40%) during different growth stages (tillering, grand growth, and maturity) over three full-year seasons of 2015–2017 in clay soils of semi-arid western India. The full-season 100% soil water replenishment produced higher yield (174 t ha⁻¹), net monetary returns, and benefit-cost (B:C) ratio that decreased linearly with linear decrease in water use. Full-season 40% soil water replenishment caused a reduction in yield of about 40.7%, whereas a 70% replenishment caused a reduction in yield by 14%. The quality parameters of sugarcane improved non-significantly in high-water-deficit conditions compared with full irrigation. The smaller range of water productivity in all seasons indicated a linear decrease when irrigation water increased and yields decreased under the different treatments. The net income and B:C ratio related to marketable cane yield was highest in 100% soil water replenishment (INR 274,000 ha⁻¹ and 1.58, respectively) and then declined with the decrease in water use depth. The water deficit imposed during the long-duration grand growth stage had adverse effects on cane yield, followed by tillering and maturity stages. Deficit irrigation scheduling at 100%, 70%, and 40% soil water replenishment at tillering, grand growth, and maturity stages, respectively, was appropriate. The water requirement of seasonal sugarcane under full irrigation and water deficit conditions was 1,320 and 1,150 mm, respectively.

中文翻译：

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印度半干旱地区不同生长阶段甘蔗对不同土壤水分补充亏缺灌溉处理的响应*

本研究的目的是通过补充根区土壤水分来研究特定生长阶段特定水分亏缺的影响。采用随机区组设计对 27 个处理进行了田间试验，包括在三个完整阶段的不同生长阶段（分蘖、大生长和成熟）期间不同根区土壤水分补充水平（100%、70% 和 40%）的分组。印度西部半干旱粘土中2015-2017年的季节。全季 100% 土壤水分补充产生更高的产量（174 t ha ^-1)、净货币回报和效益成本 (B:C) 比率随着用水量的线性下降而线性下降。全季 40% 的土壤补水导致产量减少约 40.7%，而 70% 的补水导致产量减少 14%。与完全灌溉相比，高缺水条件下甘蔗的质量参数没有显着改善。各季节水分生产率的较小范围表明不同处理下灌溉水增加和产量下降时呈线性下降。在 100% 土壤补水（274,000 卢比^-1和 1.58），然后随着用水深度的降低而下降。长期盛大生长阶段的水分亏缺对甘蔗产量产生不利影响，其次是分蘖和成熟阶段。在分蘖期、大生长期和成熟期分别以 100%、70% 和 40% 的土壤水分补充为不足灌溉计划是合适的。在充分灌溉和缺水条件下，季节性甘蔗的需水量分别为 1,320 和 1,150 毫米。