Abstract:

In order to study the effect of sowing amount on dry matter production and transport capacity and grain yield of ‘Xinmai 296’, five sowing amount levels were designed as 75, 150, 225, 300 and 375 kg/hm², to determine the dry matter weight of various organs at different growth stages and grain yield under the 5 sowing amounts, and calculate the dry matter transport amount and transport rate through the formula. The results showed that under 150 kg/hm² sowing amount, the dry matter accumulation at jointing to flowering and flowering to maturity stages, dry matter production after flowering, the contribution rate of dry matter production after flowering to grain, and dry matter weight of grain at maturity stage were the highest, and the difference from those under other sowing amounts was significant. The dry matter weight of each organ after flowering reached the highest under the sowing amount of 150 kg/hm², and the dry matter weight of ear at harvest and the dry matter weight of the whole plant at each stage after flowering also reached the highest under the sowing amount of 150 kg/hm², and the difference from those under other sowing amounts was significant. The yield of ‘Xinmai 296’ reached the highest under the sowing amount of 150 kg/hm², and the difference from that under other sowing amounts reached a significant level. Under different sowing amounts, the variation trend of yield was 150 kg/hm²> 75 kg/hm²> 225 kg/hm²> 300 kg/hm²> 375 kg/hm². This study can provide reference for studying the sowing amount of different wheat varieties.

Key words: wheat, dry matter transport, vegetative organ, contribution rate