@article{oai:repository.naro.go.jp:00001642,
 author = {牧, 夏海 and OKAMURA, Natsumi and 岡村, 夏海 and MAKI, Natsumi and 小島, 誠 and KOJIMA, Makoto and 大下, 泰生 and OSHITA, Yasuo},
 journal = {中央農業総合研究センター研究報告, Bulletin of the National Agricultural Research Center},
 month = {Mar},
 note = {1. In a part of the north Kanto region, rice is grown with wheat or barley in a double cropping system; significant labor investment is required from the harvesting of winter crops to the transplanting of paddy rice, particularly in large-scale farms. To address this issue, from 2012 ～ 2014, we conducted a field experiment of an intercropping system that involved the direct sowing of rice in the inter-row spaces of fields used for the cultivation of barley by using non-tillage seeders or high-clearance intercropping seeders. Furthermore, in Kumagaya City, Saitama prefecture, we investigated the yield of the intercropping system of rice and wheat, actual cultivation conditions of that, from 2010～2014. To increase the reliability of our intercropping system for practical application, we developed a simple method to predict the growth stage of rice when it could be seeded in the inter-row spaces of wheat or barley. This growth prediction method was developed by obtaining temperature data from the automatic meteorological data acquisition system (AMeDAS), and additional corrections were made during the dry period of paddy rice cultivation. The results of our study indicated that barley yield were little affected by the intercropping of rice, provided that the rice was seeded before the jointing stage of barley. Although the seedling establishment rate of rice was lower in the intercropping system than that in normal seeding, there was no significant difference in rice yield between the two methods. The average yield (intercropped rice + barley) over the three year was 1,100 kg/10a. In Saitama, the average yield (intercropped rice (Takanari) + wheat) over the four year was 943 kg/10a. By the correction for rainfall in the dry paddy field period (until incoming water from emergence of seedling), the accuracy of growth prediction was improved.  2. In conclusion, the intercropping system of rice and barley or wheat by the direct sowing of rice in the inter-rows of winter crops by using non-tillage seeders little affected the yield of barley, provided that rice was sown before the jointing stage of barley. Intercropped rice showed decreased the rate of seedling establishment, but its yield was same as that obtained after normal seeding of a high-yielding variety at a high seeding rate. These results suggested that the intercropping system of rice and barley can improve the total yield, without requiring high labor inputs. However, further studies are required to improve this method in terms of seedling establish rate and weed management. Furthermore, improvement of the accuracy of growth prediction by using the AMeDAS data might allow the selection of appropriate rice varieties for intercropping.},
 pages = {17--28},
 title = {水稲 - 麦類二毛作体系における水稲の麦間直播技術の実態と技術展開について},
 volume = {25},
 year = {2016},
 yomi = {マキ, ナツミ and オカムラ, ナツミ and コジマ, マコト and オオシタ, ヤスオ}
}