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.
Narges Dolatmand Shahri; Iraj Tahmasebi
Abstract
A field experiment was conducted in order to study the effect of nitrogen fertilizer and plant density on yield and quality of Maize (Zea mays L.) cultivar, MV500 silage as second crop. This study was conducted in Agricultural Research Station of Kurdistan University during 2012 growing season. The experiment ...
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A field experiment was conducted in order to study the effect of nitrogen fertilizer and plant density on yield and quality of Maize (Zea mays L.) cultivar, MV500 silage as second crop. This study was conducted in Agricultural Research Station of Kurdistan University during 2012 growing season. The experiment was laid out as split plot based on randomized complete block design with three replications. The main factor was three levels of nitrogen (115, 184 and 253 kg N. ha-1). Four plant densities (8, 10, 12 and 14 plants.m-2) assigned to subplots. The results showed that as nitrogen rate increased forage yield, and crude protein content increased but NDF and ADF percentage decreased. However, ash percentage did not change by nitrogen rate. Increasing in nitrogen rate more than 184Kg N/ha had no significant effect on forage yield, protein content and NDF. Although, forage yield increased and both protein content and NDF decreased as plant density increased but ADF and Ash percentage did not affect by plant density. In conclusion, nitrogen rate more than 184 Kg N/ha and plant density more than 12 pl.m-2 had no effects on forage yield and quality. Therefore, in order to avoid environmental pollutions and reduce production costs, more nitrogen rates and plant populations not recommended.