تلخیص
The effect of liming of A' supply on grain yield and yield components of wheat has been a subject of interest to agronomists. In previous reports, effect of N deficiency on grain yield and its component were studied by deferring N supply until certain growth stage but this study was designed to grow plants in optimum N (12 mM) supply and then limited N supply at specific growth stages and examined the effect of N deficiency on grain yield and yield components of wheat. In this growth chamber study, 20° C day/night constant temperature was maintained with photoperiod 14 h and at 400 micromol m s' PPFD. The limited N (2 mM) supply was established at Zadok's growth stage 21, 31, 37 and 49. Limiting N supply at GS 21 reduced grain yield/plant by 79%; straw yield and tillers/plant both were reduced by 70% relative to control. Limiting N supply at GS 31 reduced grain yield/plant by 56% and produced about 41% less tillers and straw yield relative to control. The spikelets initiated/culm and fertile spikelets/culm were unaffected by limited N supply at these growth stages but N deficiency impaired the floret fertility of tillers and significantly reduced grains/fertile spikelet of tillers which resulted less number of grains/culm for tillers. As conclusion, N deficiency affected the grain yield components of spring wheat in the following succession; tillers/plant > number of grains/ear > mean grain weight. Nitrogen deficiency during GS 21 was the most detrimental for tiller Production and tiller survival.
Muhammad Ashraf . (1995) EFFECT OF LIMITING NITROGEN AT VARIOUS GROWTH STAGES ON GRAIN YIELD AND YIELD COMPONENTS OF SPRING WHEAT (TRITJCUM AESTIVUM L.), The Journal Soil & Environment , Volume 10, Issue (1-4).
-
Views
318 -
Downloads
32