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.
Alireza Behdadian; Afshin Soltani; Ebrahim Zeinali; Hossein Ajam Norouzi; Hassan Masoumi
Abstract
To evaluate the effects of nitrogen management at yellow budding stage on seed yield with using nitrogen nutrition index (ratio of nitrogen concentration in the plant to optimum concentration), of rapeseed farms in Gorgan, an experiment was conducted as a nested model arranged in a complete randomized ...
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To evaluate the effects of nitrogen management at yellow budding stage on seed yield with using nitrogen nutrition index (ratio of nitrogen concentration in the plant to optimum concentration), of rapeseed farms in Gorgan, an experiment was conducted as a nested model arranged in a complete randomized design (CRD) in 2010. Fifteen rapeseed fields were classified at three levels of management (optimum, middle, weak). During the experiment, questionnaires were completed by farmers for quantification of agricultural management. The results showed that levels of management are significantly difference from nitrogen nutrition index (NNI) (P<0.01). Although quantities of nitrogen nutrition index (NNI) were higher in optimum level of management than the middle and weak levels, but at all management levels during the growing season, the index was less than one. This indicates restriction in development and production due to nitrogen deficiency. Nitrogen nutrition index in yellow budding stage have, significant positive correlation (P<0.05) with seed yield, and confirmed importance of access to nitrogen sources in yellow budding stage.