Influence of Nitrogen Fertilizer and Different levels of Irrigation on Qualitative and Quantitative Yield and Determination of Morphological Characteristics of Forage Sorghum
Subject Areas : crop production
عبدالحسین آبروش
1
(گروه زراعت و اصلاح نباتات، واحد دزفول، دانشگاه آزاد اسلامي ، دزفول – ايران. )
Keywords: low irrigation - nitrogen - forage sorghum,
Abstract :
Abstract In order to survey the influence of nitrogen fertilizer and different levels of irrigation on qualitative and quantitative yield of forage sorghum ( speed feed variety ) an experiment in split plot in randomized complete block design in four replications was carried out which had three levels of 75, 85, and 100% plant water requirement as to main plot; and sub-plot included 0, 100, 200 and 300 kg/ha of nitrogen. Results showed decrease in the change of wet forage yield, dry matter weight, leaf area index, leaf protein percent, plant height and leaf number which was due to the increasing water deficit and decreasing nitrogen fertilizer in plant. The highest wet forage yield and dry forage obtained 160.3, 34.9 ton/ha in 100% and 85% plant water requirement respectively. It can be said that according to nitrogen fertilizer different levels obtained the highest wet forage yield was 161.8 ton/ha and dry forage was 300 kg pure nitrogen and the lowest wet forage yield 128.7 and 28.7 ton/ha in control treatment was obtained without using the nitrogen fertilizer. But from the view point of interaction effects of the studied cases, no significant effect was observed.
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