Effects of Different Nitrogen Forms on Growth and Physiological Characteristics of Colored Rice and Conventional Rice

Abstract

Abstract: This study took Hongdao 8, Chudao 2, and Hejing 16 as materials and treated with NO^-₃-N and NH⁺₄-N ratio of different gradients with 100:0, 75:25, 50:50, 25:75, 0:100 to study the physiological characteristics of rice to explore the effects of different nitrogen forms on physiological characteristics of colored rice and conventional rice. The results showed that under NO^-₃ / NH⁺₄ ratio 50:50, the characteristics of content in leaves and the content of soluble protein and dry weight of root and tiller number of the colored rice and conventional rice were the highest. The red rice had the 5.62 mg/g chlorophyll content in leaves and 1.18 mg/g soluble protein under 50:50 NO^-₃ / NH⁺₄ ratio, higher than conventional rice. Under the 50:50 NO^-₃ / NH⁺₄ ratio, the increasing rate of chlorophyll content were 10.8% in the leaf of Hejing 16, 10.3% of Chudao 2 and 1.4% of Hongdao 8, indicating that 50:50 NO^-₃ / NH⁺₄ ratio was the Optimum form of mixed nitrogen for rice. The tiller number of mixed nitrogen forms (50:50) was 6 times of pure nitrate nitrogen and 2 times of pure ammonium nitrogen respectively. The highest 1000-grain weight of Hongdao 8 reached 25.25 g when the ratio of ammonium nitrate to ammonium nitrate was 50:50, while the highest 1000-grain weight of Chudao 2 and Hejing 16 reached 23.72 g、28.82 g under the NO^-₃ / NH⁺₄ratio was 25:75 separately. The highest yield of Colored Rice was 33.6 g when the NO^-₃ / NH⁺₄ ratio was 50:50, while the highest yield of Chudao 2 was 49.5 g when theNO^-₃ / NH⁺₄ ratio was25:75, and the highest yield of Hejing 16 was 49.30 g when theNO^-₃ / NH⁺₄ ratio was 75:25. In all, the colored rice hadthe lower yield and 50:50 NO^-₃ / NH⁺₄ ratio could increase the yield and 1000-grain weigh of red rice 8 compared with conventional rice. This study providedtechnical support for the application of nitrogen fertilizer in rice cultivation. It also provides theoretical support for the improvement of non-ferrous rice yield.

Key words: nitrogen form, colored rice, conventional rice, chlorophyll content, soluble protein content, yield

CLC Number:

Q945.1

WEI Xiaomei, YANG Huaixian, WU Lifang. Effects of Different Nitrogen Forms on Growth and Physiological Characteristics of Colored Rice and Conventional Rice[J]. Journal of Qujing Normal University, 2024, 43(3): 41-49.

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