| South Xinjiang is dry and rainless with large evaporation.Surface drip irrigation is commonly used to irrigate crops in agricultural production activities,but there are obvious disadvantages of surface drip irrigation,such as large surface evaporation,serious soil salinization,and water and fertilizer utilization Inferior.The jujube trees in southern Xinjiang entered the blooming period in July,and the canopy air temperature in the jujube garden was high and the humidity was low.The high temperature and low humidity weather greatly affect the pollen germination and pollen tube growth of jujube trees,which makes it difficult to pollinate and prone to the phenomenon of "scorched flower",which is not conducive to pollination and fertilization,and it is easy to cause a large number of flower drop and fruit drop,which affects the later yield and quality.How to improve the utilization rate of water and fertilizer and alleviate the phenomenon of "scorched flower" is a problem worthy of study.Indirect underground drip irrigation is an efficient water-saving irrigation technology.Ordinary surface drip irrigation is guided by vertical pipes to directly infuse water and fertilizer to the soil near the root zone of the crop below the surface,reducing water evaporation and reducing fertilizer infiltration pathways,improving water and fertilizer usage efficiency.In this study,under the condition of indirect underground drip irrigation,through the installation of mist system in Zaoyuan field community,three treatments were carried out three times a day,20 minutes each time,twice a day,20 minutes each time,and 40 minutes twice a day.The influence of temperature and humidity changes in the canopy of jujube orchards,the rate of flowering,fruit setting and quality of red jujubes.In addition,in combination with indirect underground drip irrigation,three drip irrigation irrigation volumes(16,18,22 L / plant·time)and three mist treatments(the three mist treatments are all three times per day,and the fog time is different,respectively,20,40,60min)The two work together to study the water-saving high-quality drip irrigation mist-drip irrigation model under the dual-control of canopy irrigation in the root zone of the jujube tree,and the soil evaporation between trees under mist-drain conditions.The research results are as follows:(1)The mist test in Zaoyuan showed that mist can effectively improve the temperature and humidity of the canopy of Zaoyuan,and the canopy environment is different with the change of the mist period and duration.Compared with the control group,the mist can increase the canopy humidity by 2.3%-107.4% at the same time,and can reduce the canopy temperature by 2.5%-30.5%.The change of the canopy environment affects the "noon break" of the leaves.At noon,compared with CK,the photosynthetic rate of the leaves can be increased by 210.82% under the mist treatment.Three times a day,each time the mist was treated for 20 min,the weight of single fruit of red jujube increased by 16.92%,the sugar content increased by 21.96%,the acid content increased by 0.72%,and the drop rate decreased by 17.39%.T1 is the optimal treatment.(2)The two-position moisture control test of the canopy and root zone soil showed that the mist of 60 minthree times a day had the best effect of inhibiting soil evaporation,and the evaporation between trees decreased by 36.67%-62.50% compared with CK.The amount of irrigation water had a significant effect on the VC content of the fruit.Under two treatments of misting for 20 min and 60 min three times a day,the VC content of the red jujube with indirect underground drip irrigation of 22 L / plant·time and 16 L /plant · time was 24.77% higher And 15.46%.Under canopy fog conditions,moderately reducing the irrigation water in the root zone will not have a significant adverse effect on the fruit.Therefore,choose three times a day,each mist 20 min,each irrigation volume is set to 16 L / plant·times,can consume the least water,and get better quality red dates. |
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