abdolali gilani; Naeim Loveimi
Abstract
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 ...
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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.
Elyas Dehghan; Mohammad - javad Sheikhdavoodi; Hassan Zaki-Dizaji; Abdolali Gilani
Abstract
High water consumption and the cost of labor in rice transplanting method is the reason for growing tendency of farmers to Dry-bed seeding of rice in Iran. High consumption of seed and inadequate specialized machines are the problems in rice dry-bed seeding. At present rice dry-bed seeding is done with ...
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High water consumption and the cost of labor in rice transplanting method is the reason for growing tendency of farmers to Dry-bed seeding of rice in Iran. High consumption of seed and inadequate specialized machines are the problems in rice dry-bed seeding. At present rice dry-bed seeding is done with traditional drill seeder with more than of 90 kg/ha seed consumption. While planting one seed in hole with a 20×20cm planting pattern in dry-bed seeding can reduce seed consumption to 5 kg/ha. This research was conducted for fabrication and laboratory evaluation a special seed plate for rice dry-bed direct seeding with pneumatic planter. Design parameters of Seed plate were included six plate shapes and three seed hole diameters. Seed plate shapes included traditional plate without groove and five groove shapes on plate, including three trapezoidal grooves with wall angle of 30, 45 and 60 degrees and two semicircle grooves with the aperture opening 2 and 3mm and three seed hole diameters 1.2, 1.3 and 1.5mm at the three levels of vacuum pressure 40, 50 and 60 milibar compared in a completely randomized design in a factorial experiment with three replications. Indices were, seed number per hole, miss index, over index and precision of feeding index. The results showed that creating the groove on the seed plate resulted higher seed cell covering and reduced miss and over index. New grooved plates had higher precision of feeding and lower miss index than conventional seed plate. By increasing the vacuum pressure and the diameter of the seed hole, miss index decreased and over index and seed number per hole increased. By increasing the angle of the walls of the trapezoid grooves and aperture of the semicircle grooves miss index reduced and over index and seed number per hole increased. In general, the results of laboratory evaluation Showed that for direct seeding of rice in dry-bed condition with pneumatic planter, using the seed plate with trapezoidal groove wall angle of 45 degrees and a diameter of hole 1.2 mm and vacuum pressure 50 mbar were better than others.
