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首页> 外文期刊>Indian Journal of Weed Science >Lethal soil temperature under plastic mulch on growth and suppression of nutgrass
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Lethal soil temperature under plastic mulch on growth and suppression of nutgrass

机译：地膜覆盖下的致死土壤温度对坚果草生长和抑制的研究。

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摘要

Lethal soil temperature impedes tuber formation, enhances respiration and depletes the tuber's reserves and reduced size and viability. Attempts were made to increase soil temperature to lethal level by clear plastic mulch (PM), with hot water irrigation (HW), and its effect was assessed on growth of C. rotundus. During June 2010, quantity and frequency of hot water irrigation required to maximize the soil temperature was standardized using rain out shelter, load cell-digital weighing device by gravimetric method (40 liter/m2 and once in 4 days). During September 2011, effect of randomly stitched varied thickness 50, 75, 125 and 175 micron plastic mulch of size 1.25 x 1.25 m2 was spread over C. rotundus infected micro-plot and HW irrigated on soil temperature was assessed. Increased soil temperature under different thickness PM was at par with 175 micron. Further, the mean soil temperature and dayight fluctuation in plastic mulch with hot water (PM + HW) plot was congenial for C. rotundus growth,enhanced sprouting and development of new tubers during September. During April 2012, soil temperature reached at lethal level when irrigated with hot water between 2.0 - 3.0 PM t. Further, woolen blanket cover (WBC) between 4.0 PM to next day 9.0 AM, retained the warm temperature during night and maintained higher initial soil temperature next day. Thus, soil temperature was raised to lethal level (58"C) by integrating PM + HW + WBC up to 30 days during April, which caused drastic reduction in biomass(87%), number of tubers (62%) per 0.25mz and loss of tuber viability.
机译：致死的土壤温度阻碍了块茎的形成，增强了呼吸作用，耗尽了块茎的储备，并降低了大小和生存能力。尝试通过透明塑料覆盖物（PM）和热水灌溉（HW）将土壤温度提高到致死水平，并评估了其对圆形念珠菌生长的影响。在2010年6月，使用防雨棚，称重传感器数字称重装置（通过称重法）（40升/平方米，每4天一次）对达到最高土壤温度所需的热水灌溉的数量和频率进行了标准化。在2011年9月，将大小分别为1.25 x 1.25 m2的50、75、125和175微米厚度的塑料膜随机缝合在感染了圆形圆形假单胞菌的微型土地上，并评估了灌溉对土壤温度的HW。在不同厚度的PM下土壤温度升高为175微米。此外，9月期间，地膜平均温度和昼/夜波动的塑料地膜覆盖有热水（PM + HW），对圆头梭菌的生长，新块茎的发芽和发育有利。 2012年4月，在2.0至3.0 PM t之间用热水灌溉时，土壤温度达到了致命水平。此外，在下午4点至次日9.0 AM之间，毯子被子（WBC）保持夜间的温暖温度，并在第二天保持较高的初始土壤温度。因此，通过在4月将PM + HW + WBC整合多达30天，土壤温度升高至致死水平（58“ C），这导致生物量急剧下降（87％），每0.25mz的块茎数量（62％）和块茎活力丧失。

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