Effect of Different Levels of Nitrogen and Zeolite on Chlorophyll content and Forage Quality and Yield of Amaranth under Deficit Irrigation Stress
Article Type:
Research/Original Article (دارای رتبه معتبر)
Abstract:
In order to study the effect of different levels of irrigation, nitrogen and zeolite on chlorophyll content, forage yield and quality of amaranth, a split plot factorial experiment was conducted in randomized complete block design with three replicates at Research farm of Tarbiat Modarres University during 2013 and 2014 growing seasons. Main factor was three irrigation regimes, irrigation after depleting 40, 60 and 75 percent of soil available water and sub factor was the combination of the two factors: nitrogen levels 0, 80, 160 and 240 kg.h-1 and zeolite levels 0 and 10 ton.h-1. Results showed that increasing irrigation intervals, especially irrigation after depleting 75% of available water, decreased chlorophyll (37%), forage yield (40%), digestible dry matter (18%), crude protein (17%) and ash (16%) but increased neutral detergent fiber (16%) and acid detergent fiber (7%) compared to control irrigation treatments. Zeolite application under water deficit stress conditions resulted in increased chlorophyll, forage yield, digestible dry matter, crude protein and ash, and reduced NDF and ADF. Under soil water deficit conditions, also in application of zeolite, nitrogen consumption of more than 80 kg.h-1 had no significant effect on forage dry yield and quality. Therefore, in the case of zeolite application, 80 kg.h-1 nitrogen application is sufficient to obtain suitable forage yield and quality of the amaranth.
Language:
Persian
Published:
Journal of Crop Improvment, Volume:20 Issue: 1, 2018
Pages:
67 to 84
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