Abstract:

‘Yanfeng47’, ‘Yangeng218’, ‘Yangeng456’ and better application prospect new lines H50 and H199 were used as materials, with the actual harvest of Panjin, at October 5th, 15th and 25th phased harvest, measuring plant height, culm diameter of elongation internode and other morphological indexes, studies on lodging resistance of rice culms and influencing factors in different harvest periods. The results showed that the lodging index was S3>S4>S2>S1, it was shown that the weak link of occurring lodging was S3 internode. From October 5th to October 25th the lodging index showed that decreasing first and then increasing later, the lodging index was the maximum and the lodging resistance was the minimum of October 25th. During morphological indicators, plant height with the lodging index of S4 to S1 had positive correlation, with the lodging index of S3 had very significantly correlated, wall thickness and the lodging index was negative correlation, but it didn’t reach significant level. Stem diameter and the lodging index was negative correlation, with S4 and S1 reached significant level. General analysis, the best harvest time was the October 15th.