[Coupling mode of irrigation and shading for good quality and proper yield of Coffea arabica in dry-hot region]. / 干热区小粒咖啡提质增产的灌水和遮荫耦合模式.

ABSTRACT

In a field experiment with three levels of irrigation, i.e., CI, DI75 and DI50(100%, 75% and 50% full irrigation) and four levels of shade, i.e., T100, T70, T55 and T40(100%, 70%, 55% and 40% natural radiation), the effects of irrigation and shading levels on growth, yield and quality of Coffea arabica were examined. The comprehensive benefit evaluation model was established under different irrigation and shading levels. The results showed that DI75 treatment increased the contents of fat and chlorogenic acid in dry bean by 6.0% and 10.2%, DI50 treatment significantly increased the content of caffeine of dry bean, but reduced water use efficiency. Compared with T100, T70 treatment increased the yield of dry bean and water use efficiency by 27.2% and 26.8%, respectively, and increased total sugar and chlorogenic acid content in dry bean by 6.3% and 5.5%. T55 and T40 treatments significantly reduced the yield of dry bean, water use efficiency, and the contents of caffeine and chlorogenic acid of dry bean. Compared with CIT100, DI75T70 treatment increased dry bean yield and water use efficiency by 28.0% and 44.5%, and increased the contents of total sugar, protein, fat and chlorogenic acid of dry bean by 12.2%, 14.7%, 6.6% and 10.0%, respectively, but reduced the concentration of caffeine by 8.3%. The comprehensive benefit of yield and quality of DI75T70 treatment (75% full irrigation, 70% natural radiation) was the best, which could implement good quality and proper yield of C. arabica.