| Apple industry was the economic industry in loess plateau areas.Drought and frost injury limited the quality and yield of apple.As an effective water-saving irrigation,sprinkler was widely used to prevent frost injury.The air temperature was raised and the air humidity was reduced in canopy sprinkling,so the climate around the orchard was changed. It’s the research purpose weather the changed micro-environment has influence on tree-growth,fruit quantity and disease.The experiment was proceed for six months in the northwest A&F University apple station orchard which located in Shananxi province yanan luochuan City.Experiment materials were six three-year old apple trees in zone one, three-year old apple trees in zone six in apple station orchard.Materials were measured by appropriate ways.Researching on the effect of spray on canopy was done by measuring mean air temperature and air humidity in month around the orchard,stem-diameter of apple tree,shoot growth,part of the fruit internal and external quality,some diseases,date of photosynthetic,soil water content. The results were follows:1、It’s effectively to reduce the mean air temperature in month and raise the 20 cm deep soil moisture content, when there was a short and little canopy water spray in loess plateau areas.2、Fruit mildew disease and leaf cast disease are mainly affected by the apple tree varieties.It has a little effect on the percentage of diseased leaf and disease index in tree canopy spray,but a further experiment is needed.3、The influence of sugar content of fruit mainly by variety, water and fertilizer supply and diurnal amplitude.It is effectively increase the sugar content in apple fruit to treat with a small amount of water.4、The difference of growth between varieties was significant.The fruit hardness and acidity,single fruit size and weight,fruit color performance were influenced by varieties.5、The fruit tree photosynthesis is not obvious effect by canopy water spray. |
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