Study On Precipitation Index Of Ripening Disaster In Munke Grape

Munake grape is one of the famous fresh grape varieties in Xinjiang.In recent years,due to the frequent occurrence of extreme precipitation and the increase of precipitation,the cracking and rotting disaster of Munake grape has occurred seriously.The quality and yield of Munake grape have been greatly affected,which has seriously affected the income of fruit farmers.To study Munake grapes mature harvest time precipitation index of fruit cracking disasters in Kizilsu Kirgiz Autonomous Prefecture figure city Azack township sun oasis ecology garden Munake grape base,adopting JLC-RY1 type of portable field artificial rainfall simulation instrument,carrying sugar PAL-1 meter,temperature and humidity since been contemplating,such as equipment,through artificial simulated rainfall and rainfall time on Munake grape fruit traits(transverse and longitudinal diameter,weight),soluble solids content,dehiscent fruit rate elements such as impact analysis,the following preliminary conclusions:(1)The apparent traits(weight,transverse diameter and longitudinal diameter)of grape fruits presented an insignificant upward trend with the increase of daily precipitation,indicating that precipitation had no significant influence on the appearance traits of grape fruits.(2)There was a negative correlation between the soluble solids content and precipitation and the number of days.The relationship between soluble solids and daily precipitation was significantly negative logarithmic.There was a close relationship between different grape varieties and grape split rate and soluble solids content.In the natural state without precipitation,the soluble solids content of red Munake was about2.4% higher than that of white Munake,and the cracking rate was about 12% higher.Under simulated precipitation,the content of soluble solids in red Munake decreased by about 1.75% and the cracking rate increased by about 3%.The content of soluble solids was about 1.8% lower and the cracking rate was about 2% higher.The results showed that the soluble solids of red Munake were higher than that of white Munake.(3)The cracking rate of grape was significantly increased with the increase of daily precipitation and number of precipitation days,and there was a significant positive correlation between the cracking rate of grape spike and daily precipitation and number of precipitation days.With the same total precipitation,the cracking rate of single-day precipitation was higher than that of continuous multi-day precipitation,and the higher thesingle-day precipitation,the higher the cracking rate.There was a close relationship between the variety and the cracking rate of the grape,the crack resistance of white Munake is better than that of red Munake.(4)The single-day precipitation index of Munake grape cracking disaster is as follows: the single-day precipitation(R)index of mild cracking disaster is 4mm≤R < 7mm;The single-day precipitation(R)index of moderate fruit cracking disaster was: 7mm≤R <16mm;The single-day precipitation(R)index of severe cracking disaster was :16mm≤R <33mm;The index of single-day precipitation(R)of extremely severe cracking disaster was R≥33mm(5)Continuous precipitation index of Munake grape cracking disaster: light cracking disaster,when R(daily precipitation)=5mm,2≤D(number of consecutive precipitation days)≤5.When R=5mm,6≤D < 8;When R=10mm,2 < D < 6.When R=5mm,D≥8;When R=10mm,D≥6;When R=15mm,D≥2.When R=17mm,D≥2.