Entity

Time filter

Source Type


Ikejiri A.,Yamaguchi Pref Agriculture And Forestry General Technology Center | Takahashi T.,Yamaguchi University
Japanese Journal of Crop Science | Year: 2016

“Sachiyutaka” was recommended as a cultivar to be grown by Yamaguchi Prefecture in 2001. It is usually sown in mid- June but sometimes in July, because rain disturbs the sowing during the rainy season in June and July. We investigated the effect of later sowing, early July, on its yield and yield components. In addition, we confirmed the higher seed yield of “Sachiyutaka” than the other conventional cultivars in both standard and later sowing. “Sachiyutaka” sown in early July did not show lower seed yield than that sown in mid-June because of heavier seed weight and higher harvest index even though it had fewer ripening pods and lighter biomass. The average temperature during the seed ripening period was lower in the plants sown in early July than in mid-June. Not only ripening pod number but also seed number per pod and seed weight showed a significant positive correlation with seed yield in the plants sown in mid-June and in early July. “Sachiyutaka” sown in mid-June had a higher seed yield than “Tamahomare”, “Nishimusume” and “Otsuru” and even that sown in early July had a higher seed yield than conventional “Fukuyutaka”. © 2016, Crop Science Society of Japan. All rights reserved. Source


Kamada E.,Tottori University | Takahashi T.,Yamaguchi University | Ikejiri A.,Yamaguchi Pref Agriculture And Forestry General Technology Center | Uchiyama A.,Yamaguchi Pref Agriculture And Forestry General Technology Center | And 5 more authors.
Japanese Journal of Crop Science | Year: 2016

In naked barley, grain yield is increased by increasing the amount of topdressing at the spike formation stage (SFS) due to the increase in spike number. We investigated the number of emerged tillers, the nodal position of the emerged tillers and the characters concerned with productivity of tillers in cultivar “Toyonokaze” in order to clarify how the topdressing at SFS increases the spike number. We prepared five nitrogen topdressing patterns in 2012/2013 and three in 2013/2014, differing in amounts of basal dressing or topdressing at SFS. Increasing topdressing at SFS increased the number of plants with emerging tillers and also that of plants with tillers emerging at a high nodal position. The heavier topdressing at SFS increased the rate of plants emerging tillers at a higher nodal position compared to the lighter topdressing at SFS with the same amount of total fertilizer. The productive tillers expanded 5 – 8 leaves and the dry weight of these tillers was more than 1000 mg. The water soluble carbohydrate content of productive tillers was 10 – 20% while the content was more than 20% in some of the heavy nonproductive tillers and less than 10% in some of the lighter non-productive tillers. Heavier topdressing at SFS, increased the number of plants with emerging primary tillers at the 1st, 3rd and 4th nodal positions. Most of the primary tillers emerged at the 1st nodal position became productive and these plants had more than two productive tillers including the main stems. © 2016, Crop Science Society of Japan. All rights reserved. Source


Kamada E.,Yamaguchi University | Ikejiri A.,Yamaguchi Pref Agriculture And Forestry General Technology Center | Takahashi T.,Yamaguchi University | Maeoka Y.,Yamaguchi Pref Agriculture And Forestry General Technology Center | And 6 more authors.
Japanese Journal of Crop Science | Year: 2014

We examined the effect of nitrogen (N) topdressing at the spike formation stage on yield and ripening physiology of the naked barley in Yamaguchi. N dressing was applied as basal dressing (4 or 6 g m-2) -topdressing at tillering stage (2 g m-2) - topdressing at spike formation stage (2,4 or 6 g m-2) in five combinations (4-2-2, 4-2-4, 4-2-6, 6-2-2 and 6-2-4 g m-2) with a total N of 8,10 or 12 g m-2 in two seasons, 2010/2011 and 2011/2012. Yield and its components, crop growth rate (CGR), spike and leaf area index (S & LAI), net assimilation rate (NAR), and N contents of grains, spikes, leaves and stems were measured. Grain yield, spike number and biomass production were the highest in the 4-2-6 g m-2 plot (total 12 g m-2 N) in both seasons. However, topdressing at a later stage did not have a positive effect on grain yield when total N was 10 g m-2, because the grain yields were lower in the 4-2-4 g m-2 plot than in the 6-2-2 g m-2 plot. CGR, S&LAI and NAR were also the highest in the 4-2-6 g m-2 plot. The N content of whole plant was already highest at the full heading stage in the 4-2-6 g m-2 plot, and the N uptakes during the grain filling period was also highest in the 4-2-6 g m-2 plot in both seasons. CGR in the early grain filling period was lower in the 4-2-4 and 6-2-2 g m-2 plots (total 10 g m-2 N) than in the 4-2-2 g m-2 plot, (total 8 g m-2 N) due to lower NAR. Source

Discover hidden collaborations