Evaluation of Different Tillage-Planting Methods and Different Seed Rates under Dry Seeding of Rice

The area in which conservation tillage is used, and also the area in which cultivation of dry seeding method of rice is used, both, due to their advantages, are increasing. This study was done in two years (2014-2016) in Khuzestan province to compare different conservation tillage methods. The experiments were based on split plot with randomized complete blocks design with two factors and three replications under dry seeding of rice. The main factor included different methods of tillage and sub-factor included different seed rates. The main factor treatments were: strip-till-drill, twice disk + grain drill, and no tillage (direct planting) and the sub-factor treatments were: 50, 75 and 100 kg.ha-1 of seed rates. The analysis of variance of technical parameters showed significant difference in all indices. Comparison of data showed that  twice disk with 31.6 L.ha-1, no tillage with 1.62 ha.h-1 and twice disk with 1.5 million Rials per hectare had the highest value in fuel consumption, field capacity and costs per hectar, respectively, and strip-till-drill with 8.6 L.ha-1, twice disk with 0.48 ha.h-1 and strip-till-drill with 1.1 million Rials per hectare had the lowest value in those indices. Analysis of variance in two years of agronomic traits showed that tillage methods had significant effects only on 1000 grain weight and harvest index, and no effects on other indices. Among tillage methods, strip-till-drill with 3490 kg.ha-1 and twice disk with 3344 kg.ha-1 had the highest and lowest yield, respectively.