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| Effects of Cultivation Measures on Yieldand Quality of Yunkejing 5 |
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| DOI：10.16768/j.issn.1004-874X.2022.08.002 |
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| Abstract: |
| 【Objective】The study was carried out to investigate the effects of cultivation measures (transplanting
density, nitrogen application rate) on the yield and quality of high-quality japonica rice variety Yunkejing 5.【Method】
Yunkejing 5 was used as tested material, and the split-plot design was adopted in the field. Four nitrogen levels (0, 150, 240
and 330 kg/hm2
) and four transplanting densities (240 000, 300 000, 360 000 and 420 000 seedlings/hm2
) were set. The yield
characters, SPAD value, brown rice rate, amylose, polished rice rate, chalky grain rate, protein content and gel consistency
were determined to explore the effects of nitrogen application rate and cultivation density on yield and quality of japonica rice Yunkejing 5.【Result】In the range of 0-330 kg/hm2
, with the increase of nitrogen fertilizer application rate, tillers were
increased significantly, and the number of individual tillers was the highest under high nitrogen rate, reaching 18.80 per cluster;
with the increase of transplanting density, tillers were gradually decreased. The yield showed a downward trend with the increase
of transplanting density. Under the treatments with various nitrogen application rates, the highest yield was 13 308 kg/hm2 when
the transplanting density was 240 000 seedlings/hm2
. Yunkejing 5 was apt to obtain high yield at the rate of 240 kg/hm2
, and
the appropriate transplanting density could further improve the rice yield. With the gradual increase of the amount of nitrogen
fertilizer, the chalky grain rate, chalkiness degree and gel consistency showed an increasing trend. A higher polished rice rate
could be obtained with a transplanting density of 360 000 seedlings/hm2 under various nitrogen application rates, with a highest
rate of 75.10%. The head rice rate was higher under high nitrogen rate and high density, the brown rice rate and protein content
were higher at high nitrogen application rates of 240 kg/hm2
and 330 kg/hm2
, indicating that high nitrogen fertilizer could
increase the brown rice rate and protein content of rice quality.【Conclusion】Under the combination of nitrogen application
rate of 240 kg/hm2
and transplanting density of 240 000 seedlings/hm2
, the maximum yield of Yunkejing 5 is 13 308 kg/hm2
.
The comprehensive judgment of rice quality is the second grade, which is the optimal combination and can be applied to actual
production. |
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