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陕西延安市宝塔区属黄土丘陵沟壑区,具有高海拔、强光照、春季干旱、秋季多雨等特点。从2000年起我们连续3 a(年)实施富士苹果套袋栽培观察,情况如下:2000年只用了山东青岛生产的爱农牌单层纸袋。气候条件为春季干旱、高温,秋季多雨。套袋时间为7月9～25日。套袋前喷1～2次绿盾牌农抗120及硝酸钙。于9月7日观察发现,袋内果实向阳面有轻微发黄现象,树冠下部及阴面情况较好。9月23日观察,袋内果实向阳面日烧较为严重,达30%以上。除袋时间为9月25日至10月10日。于10月18日观察,果实向阳面日烧更为严重。全部套袋果与普果相比硬度小、裂果轻。2001年大量选用了国产无标志青和袋、有
Pagoda of Yan’an City, Shaanxi Province belongs to loess hilly and gully area, with the characteristics of high altitude, strong light, spring drought and rainy autumn. From 2000 onwards, we implemented Fuji apple bagging observation for 3 consecutive years (year). The situation is as follows: In 2000, we only used single-layer paper bag of Ainong brand produced in Qingdao, Shandong Province. Climatic conditions are spring drought, high temperature, autumn rainy. Bagging time for July 9 ~ 25. 1 to 2 times before the bagging green shield agricultural anti-120 and calcium nitrate. On September 7, it was observed that there was a slight yellowing on the sunward side of the bag, and the condition of the lower part of the crown and the cloudy side was better. September 23 observation, bags of fruit to the sun burned more serious, up to 30%. The bag removal time is from September 25 to October 10. Observed on October 18, the sun burned on the sun is more serious. All bagged fruit and fruit compared to the hardness of small, cracked fruit light. In 2001 a large number of selected domestic flagless green bags, there