Effect of Low Nitrogen Fertilizer Application on Growth, Yield and Quality of Rice
2009
Park, H.K., National Institute of Crop Science, RDA, Iksan, Republic of Korea | Choi, M.G., National Institute of Crop Science, RDA, Iksan, Republic of Korea | Park, T.S., National Institute of Crop Science, RDA, Iksan, Republic of Korea | Ku, B.I., National Institute of Crop Science, RDA, Iksan, Republic of Korea | Kim, Y.D., National Institute of Crop Science, RDA, Iksan, Republic of Korea | Ko, J.K., National Institute of Crop Science, RDA, Iksan, Republic of Korea | Choi, W.Y., National Institute of Crop Science, RDA, Iksan, Republic of Korea | Kim, B.K., National Institute of Crop Science, RDA, Iksan, Republic of Korea
In order to develop selection criteria for breeding of rice cultivars adaptable to low nitrogen fertilizer application, 25 lines and cultivars were tested in Iksan. Average shoot dry weight was 743 kg/10a in low nitrogen fertilizer application of 6 kg/10a, equivalent to 95% of the standard nitrogen fertilizer application cultivation of 9 kg/10a. The greater reduction in shoot dry weight at low nitrogen fertilizer application was observed in "Dami" and "Andabyeo", but less in "Hopyeong", "Pyeonganbyeo", "Hwanggeumnuri", and "Hanmaeum". There was 10% reduction in number of tillers in low nitrogen fertilizer application in "Dami", "Hopum", "Nunbora", "Onnuri" and "Nampyeongbyeo", but it was less than 3% in "Hopyeong", "Chengchengjinme", "Suweon 516", "Keunseom", and "Hanareumbyeo". The rate of decrease in panicle number at low nitrogen fertilizer application was 5% in "Nampyeongbyeo", "Andabyeo", and "Pyeonganbyeo", and 2-3% in most of the other cultivars. The photosynthetic rate at low nitrogen fertilizer application cultivation was the highest in "Andabyeo" and "Hanareumbyeo", and the lowest in "Dami". The head rice yield, harvest index, spikelet number per panicle and leaf stem ratio showed positive correlations, but panicle number per ㎡ showed negative correlation. As a result, seven rice cultivars namely, "Hopum", "Chengchengjinme", "Hopyeong", "Shindongjinbyeo", "Sobibyeo", "Dongjin 1", and "Hwanggeumnuri" were found more adaptable to low nitrogen fertilizer application in southern plain area. Those cultivars showed lower reduction in yield at low nitrogen fertilizer application cultivation with high head rice yield of 450 kg/10a and lower protein content of milled rice than that of 18 cultivars under investigation.
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