Change of growth by the phase of top dressing and the improved method of fertilizer application in wheat [Triticum aestivum]
1998
Kurai, K. (Tochigi-ken. Agricultural Experiment Station, Utsunomiya (Japan)) | Kimura, M. | Tohyama, A.
We examined the effect of top dressing to growth and yield of wheat cultivated on drained paddy field of black volcanic ash soil. Application of top dressing before internode elongation stage increased stem length, spike number, yield and lodging. The application after the stage showed a little increase of stem length, spike number and lodging, resulted in high-yielding by the increase of grain number per spike. The top dressing at heading stage had no effect on culm length; spike number, number of grains per spike and lodging, however, protein content of grain was increased and grain quality was deteriorated. As a result of the examination, we supposed that optimum time of top dressing was in internode elongation stage for a lodging resistant variety, Bando Wase, and after twenty days of internode elongation stage for a lodging susceptible variety, Norin 61. Threshold of the top dressing application was estimated by plant height, stem number and leaf color index. Reference point for Norin 61 after twenty days of internode elongation stage was under 40,000 point as plant height(cm) X stem number, 1,500 as plant height X leaf color index and 40,000 as stem number X leaf color index. The point for Bando Wase in internode elongation stage was under 46 as leaf color index and 900 as plant height X leaf color index
اظهر المزيد [+] اقل [-]