مقايسه اقتصادي الگوهاي كاشت مختلف ذرت سيلو - ي

Economic comparison of silage corn of planting patterns

In order to assess of substitution of different planting patterns in silage corn production, determine of consumption of inputs, correlation between yield and agronomic traits and comparison of average yield in planting patterns 50 ,60 and 75 cm. This study carried out in experimental farm of Slamshahr and Karaj in Tehran province for two years (2000- 2001), by using a randomized complete block design in split plot arrangement with three replication. Methodology was partial budgeting technique and marginal rate of return .In order to estimate correlation between yield and agronomic treatment and also for comparison of yield in planting patterns, by using T-test , Pearson correlation coefficient and ANOVA.According to the results, There are significant difference between the mean yield of 50cm row space and 75cm row space. The highest correlation coefficient was between yield and agronomic traits of plant height(0.88) and head lenghts (0.89). In planting pattern 50cm ,economy of water ,Fuel and land was estimated 36200 rials, 816 rials and %33.3, respectively. Increasing yield and net profit in planting pattern of 50cm was estimated %14.6 and 1.4 million rials, respectively. Marginal rate of return in planting pattern of 50cm to other planting patterns was more than interest rate. Marginal investment rate of return in planting pattern of 50cm to planting pattern of 75cm was estimated %752.3. So, according to economical analysis, 50cm row space is recommended as the best treatment.