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【Objective】 The present paper aimed to investigate the comprehensive effects of irrigation amount on soil enzyme activity, yield, quality and nutrient utilization of pepper in Sichuan Basin, and propose an appropriate irrigation amount. 【Method】 The pepper variety of Xingshuzhoula 3 was used as the experiment material. Four irrigation amount treatments were set, and the soil volumetric moisture content was controlled respectively at 35%-40% (T1), 45%-50% (T2), 55%-60% (T3), 65%-70% (T4). The soil urease, neutral phosphatase, sucrase β-Glucosidase activity and catalase activity such as yield, quality, and plant N, P, K content of peppers were determined. The interrelationship between the indicators was analyzed. 【Result】 The soil enzyme activities increased with the increase of irrigation amount. The soil urease, neutral phosphatase, sucrase, β-glucosidase and catalase activities of T4 were the highest, and the activities of some enzymes were not significantly different from those of T3.Compared with T1, the increases were 48.80%, 28.70%, 45.60%, 100.87% and 102.58%, respectively. With the increase of irrigation amount, pepper yield also increased, T4 increased by 29.05% compared with T1, and there was no significant difference in pepper yield between T3 and T4.The content of vitamin C and capsaicin in peppers decreased gradually with the increase of irrigation water, but the content of soluble sugar in peppers increased with the increase of irrigation water. The amount of irrigation increased the total accumulation of nutrients (N, P and K), the physiological use efficiency of N and K and the partial fertilizer productivity in pepper fruits and shoots. Except that the physiological utilization efficiency of P was lower than that of T4, the other nutrient utilization parameters of T3 were not significantly different from those of T4, and the physiological utilization efficiency of K was even significantly higher than that of T4.【Conclusion】When the irrigation amount is 4392-4733 t/hm² (T3 and T4), the soil enzyme activity, yield and nutrient utilization rate of pepper are all at high levels. The results of the study provide a theoretical and practical reference for the selection of the irrigation amount of facilities pepper in Sichuan Basin. [ABSTRACT FROM AUTHOR]

【Objective】The present paper aimed to explore the physiological mechanism of kiwifruit pulp colour difference, so as to provide a reference for kiwifruit pulp colour directional breeding. 【Method】Six main kiwifruit varieties in Sichuan province were used as tested materials, the representative periods of fruit development were selected, and the contents of soluble solids, dry matter, total acid, Vc, soluble protein, soluble starch, total phenols, flavonoids and main pigments, as well as the scavenging rates of ABTS free radical, DPPH free radical and hydroxyl free radical were tested, meanwhile the changes of main physiological indexes and their correlation with pulp colour were studied. 【Result】The changes of main physiological indexes of different varieties in fruit development period basically tended to be the same, ‘Hongshi 2’ and ‘Jinshi 1’ maintained high contents of total phenol, Vc and total acid during the whole fruit development period and were significantly higher than the other four varieties in DPPH, ABTS and hydroxyl radical scavenging capacity. In the early stage of fruit harvest, the dry matter content of ‘Hongyang’ was significantly higher than that of the other five varieties, the acid content was the lowest, and the soluble protein content of ‘Cuiyu’ was the highest. It was shown in the results of the analysis on the correlation between physiological index and pigment content that the flavonoid content was significantly or extremely significantly positively-correlated with the pigment content in kiwifruits of different varieties, the hydroxyl radical scavenging rate, vitamin C content and titratable acid content were significantly or extremely significantly negatively-correlated with the pigment content in kiwifruits of several varieties, and the scavenging rates of DPPH and ABTS free radicals, as well as the contents of dry matter, total soluble solid, soluble starch and soluble protein were not consistently correlated with the pigment content in kiwifruits of different varieties. 【Conclusion】There is a significant correlation between the color difference of kiwifruit pulp and some physiological indexes. When breeding, the parent configuration combination matching the target characters can be selected through the test of physiological indexes related to the color of parent pulp. [ABSTRACT FROM AUTHOR]