Experimental study and multi–objective optimization for drip irrigation of grapes in arid areas of northwest China

Abstract

Grapes are the most important cash crop in Xinjiang. However, the effective utilization of agricultural water and fertilizer in this area is relatively low, which is very unfavourable for the development of Xinjiang grape industry. At present, there is a lack of research based on multi-objective water and fertilizer optimization to guide grape production. Field experiments were thus conducted over three consecutive years (2015)(2016)(2017) to study the effects of water and fertilizer coupling on the yield, fruit quality, water use efficiency (WUE), fertilizer partial productivity (PFP), and net profits of Vitis vinifera cv. "Frey" grapes in northern Xinjiang. The optimum input range of water and fertilizer for multi-objective optimization were determined by using multiple regression and spatial analysis. Five levels of N-P2O5- K2O (180-225-495, 240-300-660, 300-375-825, 360-450-990, 420-525-1155 kg ha −1 ) were set up in the experiment, designated F60%, F80%, F100%, F120%, and F140%, respectively. Three drip irrigation levels were designated W60%, W80%, W100%, accounting for 60%, 80% and 100% of the ETc (where ETc denotes evapotranspiration under sufficient water supply for crops).The results show that at the same fertilization level, the leaf area index (LAI), vitamin C content, titratable acid, soluble solids content, dry matter yield, grape yield, PFP, and net profit increased with an increase in irrigation. They reached their maximum under full irrigation (W100%). Compared to W80% and W60% irrigation levels, the WUE at a full (W100%) irrigation was lower, but the PFP was the highest. The maximum grape bunch weight over three years was 407, 383, and 378 g, respectively. The highest harvest index (HI) was 0.460, 0.425, and 0.416, respectively. When the irrigation range was 334-348 mm and the N-P2O5-K2O fertilization range was 320-400-880~392-490-1077 kg ha −1 , the grape yield, net profit, WUE, vitamin C content, titratable acid content, and soluble solids content of the fruits reached more than 90% of their maximum values simultaneously. The results of this research provide a scientific reference for water and fertilizer management of drip irrigation in Xinjiang vineyards.

Parameterization of the AquaCrop model for simulating table grapes growth and water productivity in an arid region of Mexico

“…These values are in agreement with other studies performed over table grapes (e.g. FAO, 2019;Li et al, 2020).…”

“…The fruit yield (FY) for two cultivars are inside the range of what is produced (14-18 t/ha) in Costa de Hermosillo, northwest Mexico, following the statistical data , 2018). The grapes yield production depends mainly on the irrigation water supply and fertilization (Li et al, 2020).…”

Optimization of a Water-Saving and Fertilizer-Saving Model for Enhancing Xinjiang Korla Fragrant Pear Yield, Quality, and Net Profits under Water and Fertilizer Coupling

“…The binary quadratic regression equation was established with water and fertilizer inputs as independent variables and the comprehensive quality, yield, IWUE, PFP, and net profits of fragrant pear as dependent variables [43,44], as shown in Table 9. The regression analysis showed that the effects of water and fertilizer inputs on the indicators reached a highly significant level (p < 0.01), and the coefficients of determination were > 0.85 (Table 9).…”

Tópicos especiais em engenharia de produção 3

“…Segundo Tan e Nasurdin (2010) e Li et al (2020), as variáveis climáticas presentes no dia a dia da agricultura, em grande parte das vezes são incontroláveis, geram a necessidade de soluções criativas que auxiliam os produtores a quantificarem e trabalharem com as demais instabilidades de seus negócios. Trazendo assim, elevada importância tanto para o desenvolvimento dos grandes produtores como também para manutenção da agricultura familiar.…”