巴西东北部和墨西哥等集约化养殖地区的最佳生长期可能会降至120天以下，这对玉米等作物的成熟至关重要。
Intensively farmed areas like northeast Brazil and Mexico are likely to see their prime growing seasons fall below 120 days, which is critical for crops such as corn to mature.
大规模的洪水、长期的干旱、飓风和严重的季风每年都会造成损失，摧毁数百万吨有价值的农作物。
Massive floods, long droughts, hurricanes and severe monsoons take their toll each year, destroying millions of tons of valuable crops.
例如始于1560年的100年冷期，造成了农作物生长期的短缩。
For instance, a 100-year cold period beginning in 1560 caused shortened crop-growing seasons.
据估计，三分之一的可耕地为酸雨区，一些气候学家预测在长期范围内该国的粮食作物将出现减产。
By some estimates acid rain falls on a third of all agricultural land; some climate experts predict long-term reductions in the country's vital rice crop.
当然了，富裕国家也受到了影响：长期的干旱已经造成澳大利亚农作物产量暴跌。
Of course, wealthy countries are affected: long-term drought in Australia has caused certain crop yields to plummet.
国家航空和宇宙航行局研究人员认为，当需要在太空船种植作物时，将它纳入潜在未来长期航天任务(作物)是很理想的。
NASA researchers consider it ideal for inclusion in possible future long-term space missions when crops would need to be grown on spacecraft.
据罗伊说，夜间的保温效应可以给农场提供一些防霜措施，甚至也许会略微延长作物的生长期。
According to Roy, the nocturnal warming effect could offer farmland some measure of frost protection and may even slightly extend the growing season.
——对有些农民来说，高温意味着更长的作物生长期，但是也可能增加害虫的数量，或者改变某些作物赖以生存的气候形式。
Higher temperatures could mean longer growing seasons for some farmers but might also bring more pests or change weather patterns that some crops depend on.
在低纬度地区，更高的温度很可能会缩短作物的生长期，以其他的形式对作物产生影响；
In low latitudes higher temperatures are likely to shorten growing seasons and stress plants in other ways.
还有，暖和的气候让加拿大或俄罗斯的农作物生长期季节变长。
And a gentle warming should extend the growing season in places such as Canada and Russia.
该国已经遭受严重的干旱、暴风和沿海洪水的影响，并对降雨量将在作物最初生长期增加的预测感到十分担忧。
The country already suffers from droughts, cyclones and coastal flooding, and is worried about projections that rainfall will decrease during the primary growing season.
在长期从事耕作的地区（底海拔地区），人们用火把农作物残渣烧掉，清理出土地为下一个生长季节做好准备。
In permanently cultivated (usually lowland) areas, fires are used to burn crop residues and get the land ready for the upcoming growing season.
虽然现在的主要农作物的价格已经稳定下来了，国际发展部仍然预计近10亿人的粮食生产与购买会是一个长期性的问题。
Although prices for staple crops have now stabilised, DfID is still predicting long-term problems in producing and procuring food for nearly 1 billion people.
举例来说，在长期实践中，当地农夫发明了一种方法：挖掘出浅地坑种植农作物，这种被当地人称作“zai”的浅地坑同时也可以收集与存储稀少的雨水以灌溉农作物。
For example, it was a long-standing practice among local farmers to dig what they called zai—shallow pits that collected and concentrated scarce rainfall onto the roots of crops.
长期以来，在寒冷的季节，农民和园丁都使用温室来延长作物的生长期。
Farmers and gardeners have long used the greenhouses to extend the growing season in cold weather.
作物的抗虫能力是其本身经过长期进化形成的—套防卫体系，具有潜在的利用价值。
The insect resistance capacity of crops is one system of defense formed by long-term evolution which had potential utilization value.
霜期长则作物的生长期也长。
专家还称，长期使用化肥是导致环境恶化以及农作物患病率增加的原因之一。
Experts also argue that an increase in plant disease and the deterioration of the environment have been triggered, partly, by years of chemical fertilizer use.
这种方法简便易行，现在仍然广泛使用，使土地长期淹水，种植水稻，或使土地短期淹水，种植许多其它作物。
It is a simple method that is still widely used to keep land flooded for long periods for paddy rice production or for shorter periods for many other crops.
长期以来，盐碱、干旱、寒冷是限制作物生长、发育和产量非常严重的三大非生物胁迫因素。
It had been thought that salt and alkali, drought, and chillness were the three most serious abiotic stress factors that could restrict the growth, development and yield of crops for a long time.
红壤长期施用单一化学肥料，土壤明显酸化，土壤交换性氢铝显著增加，作物生长变差，产量降低。
The soil became acid obviously, the exchangeable al in soil increased significantly, crop grew poorly and the yield decreased after applying sole chemical fertilizer for long term.
温室设施依靠检测和控制技术为作物创造良好的生长环境，但是温室内高温、潮湿的恶劣作业环境，使人不能在其中长期工作。
The greenhouse system supplies fit environment to crops depend on detection and control technique, but it is unwholesome for people to work in the atrocious weather of greenhouse.
长期以来，改善作物的耐盐性一直是一个伟大的目标。
To improve the tolerance of plants to high salinity has been an important goal for a long time.
因此，长期饮用此水或用于灌溉农田都会对居民及农作物甚至当地的生态环境带来严重的负面影响。
So drinking or irrigating farmland for long time will undoubtedly bring serious negative impact on residents and crops even the local ecological environment.
通过连续8年长期定位试验，研究了不同施肥方式对燕山山麓平原高产粮区褐土土壤肥力和作物产量的影响。
A 8 years long term experiment was conducted on the high yield area of plain at the foot of Yanshan mountain.
根据旱地作物长期田间试验数据，论述了旱作农业生产中作物产量波动性是一个规律性现象，并用波动系数加以表述。
Based on the data of a long term field experiment of dryland crops, this article points out that yield fluctuation, expressed in fluctuating coefficient, is a regular phenomenon in dryland farming.
以褐土类潮褐土亚类潮垆土土属黑底潮砂泥土土种为研究对象，探讨长期定点不施肥对土壤养分含量及作物产量的影响。
This paper studied the effects of no fertilization on soil nutrients and crop yield in meadow cinnamon soil in Tangyin County.
以褐土类潮褐土亚类潮垆土土属黑底潮砂泥土土种为研究对象，探讨长期定点不施肥对土壤养分含量及作物产量的影响。
This paper studied the effects of no fertilization on soil nutrients and crop yield in meadow cinnamon soil in Tangyin County.
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