بررسی و تعیین بهترین روش برای تولید بذر نر عقیم و نگهدارنده نر عقیم در برنج

With considering to growth of population and resume increase rice cosumers, one way to produce more rice per unit area is use of heterosis phonomenon and hybrid rice method. F1 hybrid rice seed production is different from the others pure and improved varieties and so it must be produced for farmers every year. This project carried out in Rice Research Institute of Iran in rasht & Amol experimental fields for 5 years in order to evaluation some agronomic methods such as, to define the best A/B proportoin, kind of growth hormons & the best dosage, for produce more parental seed per unit area in hybrid rice seed multiplication method.Resultes have shown that 8A:2B parental proportoin (A/B) with 3276 kg/h is better than 6A:2B proportoin and so it can be recommended for hybrid rice seed prodution.Results also have shown the usage of hormons growth with different dosage in flowering time had significant effects on plant height, panicle exsertion, filled and unfilled grain, fertility and grain yield at 1% level and also have shown significant effects on interaction between hormons & dosage (AB) on plant height at 5% level and also have shown significant effects on interaction between size of flag leaf & hormons (AC) on panicle exertion at 1% level and panicle length at 5% level.Means comparision for the treats (in 1388) by Dancan`s method have shown that treat No.3 (GA3200PPM + Bor A 0.5% Two time spray) with 1243 kg/h located in A class and it means usage two growth hormones (Gibberellic Acid & Boric Acid) together with spraying two times in flowering time (5% & 50%) have had more effect on fertility and grain yeild than other treatments. At last this experiment had shown growth hormones (Gibberellic Acid & Boric Acid) are so important for seed production and also there is`not significant effects between usage of Gibberellic & Boric Acid. So because Giberlic Acid is imported and so expensive and the otherwise Boric Acid is cheap and produced inside of country and is available and also with different effect on flowering behavior therefore it is also recommended for using Boric Acid in seed production prosessing.

کلیدواژه ها:

برنج (گیاه) ، بذرها (گیاه شناختی) ، ناباروری نر ، تولید بذر