Yield performance and growth characteristics of rice grown in plastic film mulched dryland
2002
JIN Qian-yu | OUYANG You-nan | ZHANG Guo-ping
Multi-location experiments were conducted to study the effects of planting rice in plastic film mulched dryland (PFMD) on growth and yield formation in rice. The results showed that, compared with the unmulched control (CK1), PFMD increased rice yields by 7.3%-467.8%, depending on the locations. Regions differing in dryness, if ranked in descending order according to the efficiency of PFMD in improving rice yield, were as follows: the arid and semi-arid region, the semi-arid and semi-humid region and the humid region. In comparison with the conventional paddy management (CK2), PFMD increased yield of rice by 7.6%-25.6% at selected locations in the northern part of China, such as Heilongjiang and Shanxi provinces, but gave about the same yield as the control in the south, such as Zhejiang Province. Rice plants grown in PFMD had, in average, (48.8-247.5) ×10<sup>4</sup>/hm<sup>2</sup> more effective panicles than CK1 and (12.3-61.5)×10<sup>4</sup>/hm<sup>2</sup> more than CK2, which might be due to earlier tillering and more tillers per plant in PFMD. Furthermore, total leaf area and dry matter per hill in PFMD was larger than in both CK1 and CK2. It should be pointed out that there were some disadvantages for PFMD such as slower heading, lower effective panicle rate, larger variation in spikelets per panicle and unsteady filled grain rate.
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