英语翻译During the first part of the 2008 growing season,rainfall totals were below normal,and irrigation was required to keep soil water levels at an adequate level.This corresponded to the observed low soil water potential values from May to Ju

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英语翻译During the first part of the 2008 growing season,rainfall totals were below normal,and irrigation was required to keep soil water levels at an adequate level.This corresponded to the observed low soil water potential values from May to Ju
英语翻译
During the first part of the 2008 growing season,rainfall totals were below normal,and irrigation was required to keep soil water levels at an adequate level.This corresponded to the observed low soil water potential values from May to July (DOY 142 to 191).Both the 30 and 60 cm deep soil water potentials followed the same trend (60 cm soil water potential; data not shown).During this time period,the 100% irrigation applications (12.5 mm per application) were generally not large enough to keep the 30 cm deep soil water potential less than -30 kPa,but soil water potential was still greater than -50 kPa and did not trigger the additional 12.5 mm irrigation.
In 2009,the overall four- and eight-week hay yields were not correlated to the irrigation treatment.Only the October 2009 four- and eight-week harvests were correlated to irrigation treatment.The 2009 rainfall distribution was at or above normal for most of the early growing season.How- ever in late August and September (DOY 225-272),the rainfall was well below normal.This low rainfall contributed to both the low observed soil water potentials and the yield response to increasing amounts of irrigation.

英语翻译During the first part of the 2008 growing season,rainfall totals were below normal,and irrigation was required to keep soil water levels at an adequate level.This corresponded to the observed low soil water potential values from May to Ju
你这是什么作业里的啊.
2008年生长季节的第一阶段,降水总体上讲比较正常,需要进行一定的灌溉来保证充足的土壤水分,这和往期观测到的五月到七月份期间较低的土壤水势是相关的.30厘米和60厘米土层的土壤水势都比较符合这一趋势（60厘米土层土壤水势的数据未给出）.在这一阶段里,100%的降雨强度（每次12毫米）一般不足以保证30cm土层处的土水势低于-30kPa,但是土水势一般还是要高于-50kPa,不足以触发另外一次12.5mm的灌溉.
在2009年,整个4周和8周的干草产量和灌溉处理都没有关系.只有2009年10月份的产量与灌溉处理相关.2009年的降雨分布达到或者超过了作物生长早期需要的灌水量.但是在后期的8月和9月份,降水低于正常值.这导致了较低的土水势,以及产量随灌溉水的增多而增高.

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