The first is what is known as the 'crop factor'.
第一点就是被一些专业人士所熟知的“裁切系数”(crop factor，也称镜头焦距转换率)。
The crop factor isn't a major issue for most users, but it does have important consequences for some.
对于大多数用户来说，裁剪系数并不是主要涉及的重点，但它会给一些特定用户带来一定的影响。
With a crop factor of 1.5x or 1.6x you need special digital lenses to get true wideangle results, but these are readily available and are usually less expensive than their 'full frame' counterparts.
只有配用1.5x或1.6x镜头焦距转换率的镜头，方能获得正常的广角效果，不过也不必担心什么，这些镜头已经随处可见，并且比起全画幅的要便宜不少。
But no matter how much we maximize crop yield per acre, the limiting factor for food production is land.
但是不管我们如何最大化粮食亩产量，最大的制约因素还是土地。
Soil salinization is an important factor that can affect crop growth.
土壤盐渍化是影响作物生长的一个重要因素。
Asian rust is another factor that could determine the success of Brazil's crop.
亚洲锈菌是决定巴西收成状况的又一因素。
Taro (Colocasia esculenta L. Schott), a tropical edible crop, contains an irritant factor in corm.
芋头是热带性可食用作物，球茎含有刺激因子。
Water is the main factor influencing crop yield in dryland areas, and the efficient way to increase crop yield is to improve utilization efficiency of precipitation.
水分是限制旱地作物产量最主要的因素，提高自然降水利用效率是增加旱地作物产量的有效途径。
Aluminum is the most abundant metal and the third most common element in the earth's crust and al toxicity is the major growth-limiting factor for crop cultivation on acid soils.
铝是地球上最丰富的金属和第三个最常见的元素在地壳和铝毒害是主要的生存限制因素为农作物的种植在酸性土壤。
Crop water requirement is not only an important factor for water resource management, but also a major reference for the irrigation planning.
作物需水量的掌握不但是水资源规划利用的重要因子，更是拟定灌溉计划的依据。
Sugarcane is a popular sugar crop and most promising regenerative energy crop, but drought is the most important limitation factor for its yield.
甘蔗是最主要的糖料作物和最有开发潜力的可再生能源作物，而干旱则是影响甘蔗产量的主要限制因素之一。
Soil moisture is an important part of the soil, and, is an important factor to impact plant and crop growth, and, runoff.
土壤水分是土壤的重要组成部分，是影响植物和作物生长、坡面径流发生的重要因素。
Soil salinity constitutes a major factor limiting crop production because it affects plant growth and survival.
土壤盐渍化已成为制约农作物产量的主要非生物胁迫因素。
Shading in relay intercropping system is a major factor affecting the low growing of crop growth and development.
间套作系统中荫蔽是影响低位作物生长发育的主要因素。
This paper introduces the major mathematic models of synthetic prediction of crop yield, including separation of trend factor and trend yield, simulation of trend yield;
介绍了农作物产量综合预测的建模思路以及建模各阶段的主要算法。包含农作物产量预测的趋势因子和趋势产量的分离；
Photosynthesis is the basis of plant productivity and crop yield, water stress is a important environmental factor inhibiting photosynthesis.
光合作用是作物干物质积累和产量的基础，而干旱胁迫是抑制光合作用的重要环境因素。
Unusual climate is the main barrier factor of local apricot cultivation and crop in high quality.
异常气候是影响当地杏树栽培优质丰产的主要障碍因素。
Starch biosynthesis is important for plant development and is a critical factor in crop quality and nutrition.
淀粉合成对植物发育有重要作用，对谷类的品质和营养成分也是至关重要的因素。
Al toxicity is a major limited factor for crop production and quality in acid soil, and it has become the focus of ongoing research in the area of plant stress physiology and genetics.
铝毒是酸性土壤影响作物生长的主要原因，已成为植物胁迫生理学与遗传学的重要研究内容。
The combination of Aluminium toxicity with soil acidity is a major crop growth limiting factor in over 40% of the arable land in the world.
世界上40%以上的耕地因为铝离子毒性和土壤酸性的综合作用而限制了农作物的生长。
Seed is the internal factor of improved crop yield and is the materialization of advanced technology vector.
良种是作物增产的内因，是先进技术的物化载体。
Seed is the internal factor of improved crop yield and is the materialization of advanced technology vector.
良种是作物增产的内因，是先进技术的物化载体。
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