Abstract: The studies showed that dry matter accumulation in wheat plants changed with the amount of O-J irrigations.The translocation of dry matter from leaves to stems tended to increase before the bearing period,while the translocation of dry matter from leaves to spikes tended to increase after that period.Dry matter accumulation in sheathes reached maximum either in the 5th-spring-leaf period when the amount of O-J irrigations was above 900 m⊃3;/ha,or in the 4th-spring-leaf period when this amount was below 900 m⊃3;/ha.Dry matter accumulation in stems and spikes tended to increase throughout the life cycle.The different combinations of O-J irrigations had a remarkable effect on the soluble sugar content in different wheat organs.The soluble sugar content in stems,when the amount of O-J irrigations was higher than 600 m⊃3;/ha,had two peak periods,one being the 5th-spring-leaf period and the other being the kernels formation period.That of stems increased with the decrease of the amount of O-J irrigations before the period of kernels formation.That of leaves increased before bloom and decreased after that,while most of photosynthate in leaves was translocated into spikes,sheathes were found similar to leaves in the translocation of soluble sugars.That of kernels increased before the kernels formation period and decreased afterwards.The starch content of kernels obviously increased after the kernels formation period.

Key words: Winter wheat, Combinations of overwintesing and jointing irrigations, Matter accumulation and distribution

CLC Number: 

• S512.110.7