Establishment of production technique with high grain quality of rice variety “Akita-sake-komachi” for brewing
2014
Shibata, S. (Akita Agricultural Experiment Station (Japan)) | Kon, K. | Sato, Y.
This study was undertaken to establish the cultivation method for sake brewery rice “Akita-sake-komachi” with high grain quality (low protein content of grain, low ratio of “harajiro” in the transverse section of brown rice and few of heavily and slightly cracked rice). The results are summarized as follows; 1. To decrease the grain protein content under 7.2%, target of yield was 60kg/a and of optimum spikelets per square m was 22,600. In this case, the leaf color value at full heading stage might below 36 with no top dressing or 38 with top dressing of nitrogen. In addition, our research shows growth quantity from plant length and number of stems so that we may predict the yield and lodging. 2. To lower the ratio of “harajiro” in the transverse section of brown rice, target of 1,000 grain weight was 27.5g, and it was necessary to stop the top dressing of nitrogen at the meiotic stage. And diagnosis of the top dressing at panicle initiation stage have provided by the leaf color value and growth quantity. 3. To lower the ratio of heavily and slightly cracked rice, it was estimated that the optimum harvest start time was 1,000℃ (temperature accumulated after heading). Especially, harvest temperature after 1,050℃ would provide a high ratio of heavily and slightly cracked rice at the high temperature ripening year. 4. Transplanted at the 3th leaf stage, the main stem (M) and primary tillers at nordal positions 3 through 5 (T3 to T5) are more suitable for the stable production of rice with high whole grain ratio and low protein content. And then, transplanted at the 2nd leaf stage, M and T2 to T4 are also suitable for the stable production of rice.
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