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To investigate the impact of climate change on the growth period and yield of irrigated spring maize in arid region of Northwest China, the study was conducted based on located observational experiment and climatic data from 1984 to 2022. The results showed that the temperature increased significantly during the entire growth period with a climate trend rate of 0.76°C•10y-1 (P<0.01), and a significant rise in active accumulated temperature above 10°C, with a climate trend rate of 135.80°C•d•10y-1 (P<0.01). Although there was no significant change in precipitation during the entire growth period, it increased significantly during the milky-maturity stage, with a climate trend rate of 4.50mm•10y-1 (P<0.05). The sunshine duration increased significantly from 1984 to 2004, with a climate trend rate of 126.88h•10y-1 (P<0.01), but decreased significantly in the last 19 years, with a climate trend rate of -109.38h•10y-1 (P<0.01). The growth days of spring maize increased from 1984 to 2004, with a climatic trend rate of 9.86d•10y-1 (P<0.01), but decreased significantly in the last 19 years, with a climatic trend rate of 7.39d•10y-1 . The length of sowing-seedling and seventh leaf-jointing was significantly negatively correlated with temperature, respectively. The length of sowing-seeding, third leaf-seventh leaf and silking-milky was significantly positively correlated (P<0.05) with precipitation, respectively. The length of different growth periods was significantly positively correlated (P<0.01) with sunshine duration, respectively. The yield of spring maize fluctuated and climatic yield was significantly negatively correlated (P<0.05) with precipitation. In summary, climate change has been unfavorable to spring maize growth under current irrigation methods in arid region of northwest China. [ABSTRACT FROM AUTHOR]

[Objective] The fresh-keeping technology and the change rules of qualities of Guangxi winter Kyoho grapes during storage were studied to provide theoretical references for Guangxi Kyoho grape preservation and fresh-keeping. [Method] Winter Kyoho grape , as the test material, was post-processed by seven freshness keeping (chemical and biological freshness keeping) treatments with non-processing fruit as the control. The qualities indexes of grape fruits were determined every month for 5 continuous times. [Result] The results showed that with the extension of storage period, abscission rate and pH rose, while intact rate decreased constantly. TS (total sugar)content rose first and then fell. TA (titratable acid), TSS (total soluble solids)and Vc content were degradative. Intact rate of chemical freshness treatments was over 85% after 5 months storage, however, it was only 13.66% in the contorl. Contents of TS, TSS and Vc of all fresh-keeping treatments were significantly higher than those of the control at the same period (P< 0.05). Contents of TA of chemical freshness keeping were higher than those of the control. The biological freshness keeping agents could keep good value of grape fruit in a short storage period (0-3months). [Conclusion]Cold storage with freshness keeping agents could effectively maintain the quality of grape fruit and the best storage period of Guangxi winter Kyoho grapes is 0-3 months. [ABSTRACT FROM AUTHOR]

[Objective] The quality evaluation factors of mango fruit were simplified to provide theoretical references for the establishment of mango quality indexes. [Method] Nineteen quality parameters from eighteen varieties of mango fruit in Guangxi areas, including fruit shape index, flesh firmness, contents of total soluble solids, titratable acid (TA), soluble sugar (SS ), flavor, etc, were measured. The data were analyzed by principal component analysis, systematic cluster analysis, and rationalization satisfaction index and the consolidating rule of multidimensional value theory, after which quality evaluation factors of the mango fruit were filtered. [Result] The results showed that there was either relative independence or close correspondence among the characteristics indicators of fruit quality. Seven indicators were selected according to the principal component scores. Based on the above results, 9 indicators for evaluating mango quality were obtained by systematic cluster analysis. Zill No.6, Zihua, Guire No.82, Guire No. 120, and Xiang-mang were selected for better quality varieties. The data of these 9 indicators of all tested fruits were analyzed with rationalization-satisfaction index and the consolidating rule of multidimensional value theory are suitable for selecting evaluation factors for mango fruit quality. [ABSTRACT FROM AUTHOR]