The paratroopers , armed with exercise rifles that shoot rubber bullets , landed in a corn field outside the fremont correctional institute , colorado department of corrections spokeswoman katherine sanguinetti said 科罗拉多惩教部女发言人凯萨琳桑奎内提指出，这批天兵配备发射塑胶子弹的演习用步枪，降落在弗雷蒙特惩教所外的一个玉米田。
I explained to them that they have corn fields here and the corn is all picked but then theres an ear that may fall here and another ear that may fall there and they dont hire people to pick it up . if we want to go there and pick up those pieces of corn we may do so 我向他们解释，那些玉米田在收割后，一粒一粒玉米会散落在田里各处，他们不会雇人去捡这些玉米如果我们要去捡玉米的话，他们会欢迎我们。
The results are as follows : ( 1 ) based on soil temperature data measured at different time in the field , soil temperature characteristics under plastic mulch were analyzed at four locations : the middle , the edge , in - between the plastic film and uncovered spot ; the characteristics of soil temperature profile from 0 to 25cm depth and the correlation of soil temperatures in different soil layers were studied at different time with and without plastic mulch ; on the basis of analyzing temporal and spatial variations of soil temperature in a corn field , the relations between soil temperature and air temperature were established , and a new method that only uses air temperature to predict soil temperature profile at different time is proposed . the predicted results showed good accuracy 成果如下： ( 1 )根据大田实测地温资料，分析了覆膜条件下膜中、膜边、膜间和揭膜四种处理在早、中、晚三个不同时刻的地温特征；分析研究了各观测时刻覆膜与不覆膜条件下0 25cm剖面地温的特点及各层地温间的相关关系；在重点对玉米田地温时空变化特征分析的基础上，首次将覆膜与不覆膜不同时刻观测的剖面地温与气温建立了联系，提出了仅根据气温资料来预测一日内不同时刻剖面地温的新方法，预测结果表明其精度较高。
In light of current using situation and drawing on the experience of many scholars researched methods and viewpoints , this thesis made com land , fallow land , orchard , grass land as experimental field in black soil region jlau , which carried out experiment by applying different amounts of n and p fertilization in corn field . by means of collecting the samples of rainfall runoff , erosion silt and surface layer soil before and after rainfall for one year nature precipitation in field , we study the effect of surface runoff on n and p nutrient and fertility degeneration . the results showed : ( l ) there are lots of factors which affect soil erosion and losses of n and p , in which rainfall and rainfall intensity were more important , while rainfall intensity is the most important meteorological phenomena factor 针对当前黑土利用现状，本文借鉴众多学者的研究方法和观点，在吉林农大黑土区选择利用方式不同的玉米地、休闲地、果园、草地，在玉米区进行了不同数量的施肥，通过野外试验，采集一年自然降雨产流及泥沙样品，同时采集降雨前后的耕层土壤样品，研究了黑土区地表径流对氮磷养分特征及肥力退化的影响，结果表明：土壤侵蚀和氮磷的流失受诸多因素的影响，降雨量、降雨强度是重要因子，而降雨强度是影响农田地表径流养分流失的最重要的气象因子，特别是暴雨，暴雨径流中氮磷浓度较平时高得多；随作物生长，覆盖度逐渐增加以及不同利用方式下表现的覆盖度差异，氮磷流失都表现为显著的差异。
Aiming at the defects of the imc - 70 model stubble - plastic film residue collector that the draft is rather great and the plastic residue or stubble are sometimes left out in the operation process , formulas for the principal parameters of the knives have been driven out based on the analysis of the distribution manner in the field of the stubble and plastic film residue , the variation range and the variation tendency of the principal parameters for the reduction of the draft have been found on a trial basis in the corn field through theoretical analysis and experimental study and a mathematical model for the draft applied on the knives has been established in accordance with the movement and distortion of the soil under the action of the knives 本文针对1mc ? 70型地膜回收起茬机起膜、起茬铲刀在作业中阻力大，残膜、根茬有漏起的现象，通过对作物收获后残膜、根茬在田间分布情况的分析，推导出铲刀满足生产要求主要参数的求取方法和公式，并经理论分析和试验研究，确定了铲刀对玉米茬地进行起膜、起茬时主要参数的取值范围和减小牵引阻力各参数的取值规律。以铲刀作用下土壤的运动变形为基础，建立了铲刀牵引阻力模型。
With the first - hand data about the changing rules in cropland evapotranspiration collected by the ranzhuang water resources experiment station from the wheat and corn field , an analysis is made on the changing rules cropland evapotranspiration course and depth , and the concerned data range in the condition of experiment is brought forward 摘要根据冉庄水资源实验站大型地中蒸渗仪在种植小麦、玉米情况下的农田蒸散发量实测资料，分析了农田蒸散发量的时程及深度变化规律，提出了在实验条件下农田蒸散发量的数值范围。
The testing result in sandy soil shows that the law that the principal parameters of the knives exert influence on the draft approximately approaches to the result theoretically driven out , and a pair of knives has been chosen to be a favourable one with satisfactory performance and smaller draft for the plastic film mulched corn field through the contrast tests to number of pairs of knives 砂质壤土中的试验表明，铲刀主要参数对牵引阻力的影响规律与理论推导结果相近。通过多副铲刀的对比试验，选取出对玉米茬地进行起膜、起茬作业时，性能良好，牵引阻力较小的铲刀。
