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Dry matter accumulation and distribution during growth stages in different wheat cultivars as influenced by nitrogen levels | ||
| Jornal of Al-Muthanna for Agricultural Sciences | ||
| Article 1, Volume 3, Issue 1, 2015, Pages 1-19 | ||
| Abstract | ||
| Abstract A field experiment was conducted at Al-Daire site (40 km) north of Basrah.The experiment was conducted to investigate the effects of different nitrogen fertilizer levels on dry matter accumulation on different plant parts , and their distribution in plants in three cultivars of wheat plants during winter season of 2011-2012 and their effects on yield of wheat during the growing seasons of (2011-2012) and (2012-2013). The experimental design was a split-plots in R.C.B. design with three replicates, where nitrogen rates (0, 60,120 and240Kg h-1 occupied the main plots,while Cultivars (IPA-99, Abu-Graib and Latifia) occupied the sub- plots. Samples of wheat plants were collected at 10 stages of the growing period: seedling growth, tillering (Main shoot and 1 tiller), tillering (Main shoot and 4 tillers), stem elongation, booting, 50% of spike visible, 50% flowering, milk stage, dough stage and maturity. Each plant sample was separated into different plant parts (blades, sheathes, stems, flag leaves, spikes and seeds),These parts were dried at 70°C.The dry weight of each part was recorded .Final grain yield was recorded Increasing nitrogen rates increased weight of different plant parts, but did not influence the relative proportion of each plant part for all cultivars. Rapid growth for all cultivars and nitrogen rates began after start tillering stage and continued till 50% flowering stage. Dry matter accumulation among cultivars did not differ at early growth period , however after growth stage 50% flowering plants dry weight of Cv.IPA-99 was higher than other cultivars.Different N rates did not affect dry matter produced during the early growth period ,then after dry weight of plants increased as N rates increased but increasing nitrogen rate from 120 to240KgNha-1did not incease dry matter product. | ||
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