Seyfollah Halalkhor; Salman Dastan; Afshin Soltani; Hossein Ajam Norouzi
Abstract
Documentation process in agricultural production includes providing all information and activities that show the production route of one crop from providing stage of seed laying to harvest. For this purpose, in this research all finished managing operation from providing stage of seed preparation to ...
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Documentation process in agricultural production includes providing all information and activities that show the production route of one crop from providing stage of seed laying to harvest. For this purpose, in this research all finished managing operation from providing stage of seed preparation to harvest for local cultivars of rice was recorded trough fields studies in Mazandaran, Babol in 2015e2016. Result showed that from 155 variables under research, the final model with six independent variables was chosen. In yield model, maximum and average yield were 6489 and 4572 kg ha-1, respectively that estimated is comparable to observed average and maximum yield (4572 and 6489 kg ha-1). All estimated yield gap was equivalent to 1977 kg ha-1. The amount of yield increase result from yield difference of two variables of the best and average pest and weed problems were equals 7.3 per cent of total yield increase (140 and 59 kg ha-1), respectively. The amount of increase yield related to fallow variable equal’s 62 kg ha-1 includes three per cent of total yield increase. The quantity of yield increase related to the effect of Amrollahi cultivar and plant density was 375 and 367 kg ha-1, respectively which equals to 19 per cent of total yield variation. Therefore, on the basis of findings, we can state that the precision of the model was appropriate and can be applied for both the evaluation of the amount of yield gap and determining the portion of each restricting yield variables.
Salman Dastan; Ghorban Noormohamadi; Hamid Madani
Abstract
To evaluate of rice genotypes in various modified systems, an experiment was carried out as split plot in randomized complete blocks design with four replications at Neka region, Mazandaran province, Iran in 2011-2012. Cropping systems were chosen as main plots including conventional, improved and System ...
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To evaluate of rice genotypes in various modified systems, an experiment was carried out as split plot in randomized complete blocks design with four replications at Neka region, Mazandaran province, Iran in 2011-2012. Cropping systems were chosen as main plots including conventional, improved and System of Rice Intensification (SRI) and genotypes as sub plots including: Sang Tarom, Hashemi Tarom, Neda and Shiroodi. The results indicated that the most number of fertile tiller per hill, number of spikelet per square meter (374.8 number) and number of filled spikelet percentage per panicle was produced in SRI that has led to the most paddy yield (6412 kg/ha). The most number of filled spikelet per panicle and filled spikelet percentage per panicle was obtained for cv. Tarom Hashemi. But, number of panicle per square meter (396.8) was the highest in cv. Neda. The maximum paddy yields were 7272 and 7315 kg/ha for cv. Neda and Shiroodi. The highest paddy yield was 7770 kg/ha that produced using SRI and cv. Neda. Paddy yield in SRI was 5.44 and 12.65 percentage more than improved and conventional systems, respectively. Therefore, SRI was a cropping system that with creating optimum management practices had led to increase of paddy yield and yield components of rice.