Compared with control, dressing treatments significantly increased post-anthesis nitrogen assimilation in Xumai 26 of Xuzhou and Sumai 6 of Nanjing, reduced the transfer ratio of reserved nitrogen in vegetative organs to the grains, but increased that in Huaimai 18. Grain protein content of Xumai 26 and Sumai 6 was significantly correlated with post-anthesis nitrogen assimilation.
Grain N for the low protein variety “Jing Hua 1”was mainly redistributed from N that accumulated in vegetative parts in earlier stage,for the high protein varieties“Jing 771”and “Jimai 23”,however,not only the former,but also continuous absorption and assimilation of N after anthesis.
The ratio of N contents between vegetative organs and reproductive organs was 4∶6. Of the N contents in vegetative organs,most parts were stored in leaves,occupying about 30% of the whole N contents in plants.
A field trial was conducted to study the relationship between protein content and accumulation and distribution of carbohydrate(C)and nitrogen(N)by using “high”and “low”protein wheat varieties with N fertilizer application.The results indicated that N was mainly accumulated in leaves before anthesis,and after that in grains.Grain N for the low protein variety “Jing Hua 1”was mainly redistributed from N that accumulated in vegetative parts in earlier stage,for the high protein varieties“Jing 771”and “Jim...
This research was conducted in low yield fields(lint about 750 kg/hm 2),middleyieldfields(lintabout1125kg/hm 2),highyieldfields(lintabout 1 500 kg/hm 2) and super high yield fields(lint about 1 875 kg/hm 2) in Changsha,Changde and Nanxian of Hunan from 1992 to 1998. The results obtained showed that N contents in cotton plants of various yield fields varied a lot. With the rise of yield and application of N fertilizer, N contents in cotton plants increased. Whats more,N contents in different organs diff...
A field experiments was carried out to investigate the effects of nitrogen topdressing time on the (nitrogen) accumulation and transfer, grain yield and protein content of two specialty wheat cultivars, Xumai 26 and Huaimai 18 under high yield conditions. The results showed that the nitrogen topdressing at jointing and (booting) stages increased the grain yield and protein content but the topdressing at heading and flowering stages might be unfavorable to simultaneously increase the yield and protein conten...