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我县农技站从1980—1986年,连续7年在全县16个区点对温室育秧产生“窝团烂根”的原因进行了探索总结,对防止办法进行了试验研究,发现产生“窝团烂根”主要原因是:温室秧,秧苗在一叶盘根期温度和水分失调所致。因为无土秧苗呼吸旺盛,当秧苗进入一叶盘根期,根系成倍增长,呼吸强度大,释放出来的热能较多。据检查记载:一叶盘根期的秧苗根际温度较温室温度高4.5—5.3℃,如果温室内的温度达到30℃,秧根的温度可达到35℃—35.5℃。此时如不及时喷水或喷水不匀,加之秧盘不平,秧尖很快就出现灼伤状
Agricultural Science and Technology Station in our county from 1980 to 1986, for seven consecutive years in the county’s 16 districts on the greenhouse seedlings produce “nest rotten root” causes were explored to prevent the pilot conducted a study found that “nest Rotten roots ”main reason is: greenhouse seedlings, seedlings in a leaf dish temperature and moisture imbalance caused. Because of soilless seedlings breathe strong, when the seedlings into a leaf packing stage, root doubling growth, respiratory intensity, the release of more heat. According to the inspection records: a leaf packing seedling rhizosphere temperature higher than the greenhouse temperature 4.5-5.3 ℃, if the greenhouse temperature reaches 30 ℃, seedling root temperature can reach 35 ℃ -35.5 ℃. At this point if not timely water or water spray uneven, combined with uneven seedling tray, seedling tip burns quickly appeared