Rice cultivar differences in suppression of barnyardgrass (Echinochloa crus-galli) and economics of reduced propanil rates
Rice cultivar differences in suppression of barnyardgrass (Echinochloa crus-galli) and economics of reduced propanil rates
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DOI：
10.1614/0043-1745(2003)051
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发表时间：
2003-07-01
期刊：
影响因子：
2.5
通讯作者：
Chavez, RSC
中科院分区：
文献类型：
--
作者：
Gealy, DR;Wailes, EJ;Chavez, RSC
通过田间试验，比较了4个美国品种(‘Starbonnet’、‘Kaybonnet’、‘Lemont’和‘Cypress’)和3个竞争激烈的亚洲高产品种(‘PI 312777’、‘贵潮’和‘特青’)对无芒草的抑制效果。此外，还评估了在这些品种上少施丙醇量的经济后果。随着丙醇用量的增加，籽粒产量增加，无芒草生物量下降。无论有没有丙胺，亚洲水稻品种都比美国水稻品种持续更多地抑制无芒草，从而产生更高的粮食产量。亚洲品种使用丙胺的经济效益低于美国品种。与商业品种相比，亚洲品种生产更高的粗米产量，导致更高的净收益(未经碾磨调整)，但在调整其较低的碾米产量时，这一优势通常会减弱。这些结果表明，在康涅狄格州种植亚洲杂草抑制水稻品种。在美国南部，减少除草剂用量可能是一种有效而经济的水稻杂草管理策略。但是，首先，必须改进它们的株型和品质性状。
Field studies were conducted to compare the barnyardgrass suppression by four U.S. ('Starbonnet', 'Kaybonnet', 'Lemont', and 'Cypress') and three highly competitive, high-yielding Asian cultivars ('PI 312777', 'Guichao', and 'Teqing'). The economic consequence of applying less than the recommended propanil rates to these cultivars was also evaluated. Grain yields increased, and barnyardgrass biomass decreased with increasing propanil rates. With or without propanil, the Asian rice cultivars consistently suppressed barnyardgrass more and consequently produced higher grain yields than did U.S. cultivars. The economic benefit derived from propanil application was less for Asian than for U.S. cultivars. Asian cultivars produced higher rough rice yields, resulting in higher net returns (not adjusted for milling) than did the commercial cultivars, but this advantage was usually reduced when adjusting for their lower milling yields. These results suggest that growing weed-suppressive Asian rice cultivars in conj. unction with reduced herbicide rates could be an effective and economical weed management strategy for rice in the southern United States. However, first, their plant type and grain quality characteristics must be improved.