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.
Hosein Jahangiri; Enayatollah TohidiNejad; Masood Torabi; Poorandokht Golkar
Abstract
Effect of different planting ratios of oat (Avena sativa L.) and vetch (Vicia sativa L.) was assessed on quality and quantity of forage and silage in an intercropping system as completely randomized block design (RCBD) with four replications. The treatments were different planting ratios of oat and vetch ...
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Effect of different planting ratios of oat (Avena sativa L.) and vetch (Vicia sativa L.) was assessed on quality and quantity of forage and silage in an intercropping system as completely randomized block design (RCBD) with four replications. The treatments were different planting ratios of oat and vetch including 0:100, 20:80, 40:60, 50:50, 60:40, 80:20 and 100:0 (Oat-Vetch) formed as replacement series. The results indicated that the highest quantitative yield obtained from 40 percent: vetch + 60 percent oat where their fresh and dry matters were 62.88 and 15.72 ton/ha, respectively. The results obtained from analysis of variance showed, all the parameters including crude protein, butyric acid, lactic acid, acetic acid, Natural Detergent Fiber (NDF) and Acid Detergent Fiber (ADF), propionic acid were significantly different with differing planting compositions except ethanol and ammoniac nitrogen. Monoculture of vetch (0-100) produced the highest level of crude protein, butyric acid and lactic acid whereas maximum acetic acid was obtained from 20 percent vetch + 80 percent oat. Maximum NDF and ADF observed from 40 percent vetch + 60 percent oat and the highest level of propionic acid were related to oat monoculture. Generally the ratio of 40 percent vetch + 60 percent oat with maximum of quality and quantity of yield was superior to others and it was acceptable as qualitative characteristics.