Somayeh Karami; Hashem Hadi; Mehdi Tajbaksh; Seyed Ali Mohammad Modarres-Sanavy
Abstract
In order to study the effect of different levels of irrigation, nitrogen and zeolite onchlorophyll content, forage yield and quality of amaranth, a split plot factorial experiment was conducted as randomized complete block design with three replications at the Research Farm of Tarbiat Modarres University ...
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In order to study the effect of different levels of irrigation, nitrogen and zeolite onchlorophyll content, forage yield and quality of amaranth, a split plot factorial experiment was conducted as randomized complete block design with three replications at the 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 waterand 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 increased chlorophyll, forage yield, digestible dry matter, crude protein and ash, and reduced NDF and ADF. Nitrogen consumption more than 80 kg.h-1 had no significant effect on forage dry yield and quality under soil water deficit conditions and application of zeolite; Therefore, Nitrogen application (80 kg.h-1) was sufficient to obtain suitable forage yield and quality of the amaranth with zeolite application.
somayeh karami; Seyed Ali Mohammad Modarres-Sanavy; Faezeh Ghanati; MEHRDAD Moradi
Abstract
In order to study the effects of water deficit stress and zinc foliar application on yield, seed quality, seed vigor and zinc content of different organs of soybean cultivars, an experiment was conducted in randomized complete block design arrangement as a split factorial with three replications. Main ...
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In order to study the effects of water deficit stress and zinc foliar application on yield, seed quality, seed vigor and zinc content of different organs of soybean cultivars, an experiment was conducted in randomized complete block design arrangement as a split factorial with three replications. Main factor was three levels of drought stress (non stress, water stress in vegetative growth stage (S1) and water stress in flowering stage (S2)) and subordinate factor was combination of foliar zinc application and cultivar. Foliar zinc application in three levels (non foliar application, water foliar application and zinc sulfate (5000 ppm)) foliar application and two cultivars (‘L17’ and ‘Clarck 63’) were used in this experiment. Results showed that traits were affected by treatments. Water deficit stress in both vegetative and reproductive stages caused to decrease the yield, zinc content of organs, seed protein and oil percentage and seed vigor, but hard seed percentage were increased to 189 and 472 in S1 and S2, respectively. ‘Clark 63’ was desirable under water deficit stress. The highest yield reduction was observed for stress treatment at the reproductive growth stage. Zinc sulfate foliar application increased the yield, zinc content of seed, seed protein percentage and seedling vigor 34, 26, five and 38 percent, respectively, but decreased seed oil percentage and hard seed percentage four and 58, respectively. Zinc foliar application was more effective in yield increment of ‘L17’ than ‘Clarck 63’.