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苹果、梨树的根系在地温达30—35℃以上时即停止生长甚至死亡。我县七、八月份高温季节,果园地表温度往往高达60℃,严重影响果树的生长和结果。生产实践证明,果园夏种绿肥有很好的覆盖降温作用,收割的绿肥还可以作为秋施基肥的部分肥源。绿肥品种以生长期较长、叶绿体多、叶层厚的
The roots of apples and pear trees stop growing or even die when their temperature reaches above 30-35 ° C. In July and August, the hot season in our county, the orchard surface temperature is often as high as 60 ℃, seriously affecting the growth of fruit trees and the results. Production practice has proved that summer orchard green manure has a good coverage of cooling effect, harvesting of green manure can also be used as part of autumn fertilizer base fertilizer. Green manure varieties to grow longer, more chloroplasts, thick leaves