Effect of oat-fenugreek intercropping ratios, Nitrogen fertilizer and gebberellic acid on quantitative and qualitative of forage

To investigate the yield and quality of forage in mixed intercropped of Oat and fenugreek, an experiment was conducted as split split plot using randomized complete blocks design with three replications in August 2015 in Dehloran in Ilam province. In this experiment four nitrogen levels including:0, 75, 150 and 225 kg N. ha were assigned to main plots, Spraying with 5 gr of powder contains 18% gibberellic acid in two levels including: With gibberellicacid and no gibberellic acid were assigned to sub-plots and five levels of replacement ratios of mixed intercropped (100% Oat), (75% Oat +25% fenugreek), (50% Oat +50% fenugreek), (25% Oat +75% fenugreek), (100% fenugreek) were randomized in sub sub-plots. Results showed that the highest Dry matter forage yield (2933 kg.h), ADF and NDF were obtained from 100% Oat, 150 kg N. ha And application of gibberellic acid. The highest crude protein content and dry matter digestibility were obtained from 100% fenugreek, application of 150 kg N. ha and application of gibberellicacid. The highest water Soluble carbohydrates were obtained from 100% fenugreek, application of 150 kg N. ha-1 and application of gibberellicacid And highest Ash content of forage were obtained from 100% fenugreek, Without the use of nitrogen and gibberellicacid. In general, by increasing the ratio of oat culture in intercropping, the dry matter yield of forage increased and the Increasing the ratio of Fenugreek crop cultivation in intercropping forage quality increased. But the highest forage yield and forage quality were observed in pure crop. Keyword: CP, ASH, yield, DMD, intercropping ratios Introduction As the world's population continues to grow, the ecological balance will continue to deteriorate, so we must take action to increase agricultural production and preserve the environment. So far, various measures have been taken to increase crops and horticulture, such as the use of technology, genetics, chemical fertilizers, and plant toxins, but the application of these measures has only been able to meet part of our need for food on a regional basis. Therefore, food supply should be at the top of the agenda while preserving the environment. One of the ways that brings us closer to this goal is the cultivation of mixed plants (Najafi et al., 2005). Mixed cultivation increases diversity in an agricultural ecosystem and enables the establishment of interrelationships between different crops (Sastava et al., 2004). Many researchers have reported the advantages of intercropping over monoculture (Schenny et al., 2010; Zardari, 2011) which increase yield per unit area, use resources more efficiently, reduce pest problems, increase system stability and provide better nutrition. Becomes human and animal (Innocent et al., 2014). Blend cultivation of legumes and wheat is recognized as one of the most important agricultural systems applicable in many developed countries, which is of special importance for the diversity of crops and increase profits per unit area and time (Nakhzari_Moghaddam Et al., 2013). In many mixed culture experiments, the components of the mixture are a species of legume and a species of wheat, which in most cases have a superior performance over a single vessel (Liturgidis et al., 2011). In mixed cultivation of beans and wheat from wheat and legumes, it was observed that mixed cultivation improves forage quality. In this culture method, the content of crude protein and water-soluble carbohydrates (WSC) increased and the content of neutral detergent (NDF) and acidic fibers (ADF) decreased (Ghanbari-Benjar and Lee, 2003). The results of experiments have shown that legumes are JOURNAL OF CRITICAL REVIEWS ISSN2394-5125 VOL 7, ISSUE 04, 202