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tilth     
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  耕层
     STUDY ON MECHANISM OF SOYBEAN FERTILIZING SOIL Ⅲ.THE INFLUENCE OF SOYBEAN ON NITROGENOUS COMPOUNDS IN TILTH SOIL
     大豆肥田机制的研究Ⅲ.大豆对耕层土壤含氮物质影响
短句来源
     Accompanied with herbicide,the quantity of weed seeds in tilth decreased averagely by 75.4% in shallow tillage,and by 27.3% in deep tillage.
     浅耕配施除草剂,耕层杂草种子平均每年以75.4%的速度下降,深耕以27.3%速度下降;
短句来源
     In addition, the contents of the total N in the tilth layers of the four soils are all low at the treatment of NPK+S(stalk ).
     NPK+S处理耕层土壤全氮含量均较低。
短句来源
     The distribution position of cotton root system in the tilth is closely related with cotton yield.
     棉花根系在耕层分布的位置与产量密切相关.
短句来源
     The pH values of the tilth fell into the range of 4.5-5.1. The soil texture except that of the alluvial soils, were all clayey, with a clay particle content of about 30%-45%.
     耕层土壤多属强酸性,pH多为4.5~5.1; 土壤质地偏粘(冲积土除外),粘粒含量达30~45%;
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  耕作
     However, with the improvement of tilth system and recultivation and the increased utilization of nitrogen fertilizer, some problems about fertilizer utilization were exposed in rice-wheat rotation system, they could be listed as follows. The quantity of used nitrogen fertilizer was increased and that of P2O5 K2O were on the low side, it lead to a low use efficiency of fertilizer.
     但随着耕作制度的改革、复种指数的提高、施氮量的增加、稻麦连作施肥上存在不少问题,主要表现在:数量上施N量增多,P_2O_5、K_2O比例偏低,肥料利用率低;
短句来源
     It suggested that sampling grid size of 2 m × 2 m was better in indicating effect of random factors on spatial distribution of heavy metals than 10 cm × 10 cm in Fluvo-aquic soil region. Spatial distribution of heavy metals in Fluvo-aquic soil was also affected by soil texture, tilth activity, element type, and other land management practice.
     以上结果表明,2m×2m的网格更有利于反映潮土重金属有效性的空间变异受人为因素的影响,潮土重金属有效性的空间变异还受到土壤质地、耕作活动、元素类型等因素的影响。
短句来源
     The results indicate that,within 60 days of experiment,the regular urea added with 1% of DMPP can effectively inhibit the ammonium oxidation in the soil,and improve the concentration of NH~+_4-N in soil solution over the 20 cm tilth profile,while decline the concentrations of NO~-_3-N and NO~-_2-N.
     结果表明,尿素添加1%的DMPP后,与不添加DMPP尿素相比,在60 d内能有效抑制土壤铵氧化反应的发生,显著提高20 cm以上耕作层土壤水铵态氮的浓度,降低硝态氮和亚硝态氮的浓度;
短句来源
  耕性
     TILTH OF PADDY SOIL AND ITS SIGNIFICANCE ON SOIL CLASSIFICATION
     水稻土的耕性及其在土壤分类上的意义
短句来源
     In consideration of a heavy clay texture and the bad tilth of yellow soil upland and the climate characteristics of frequently occured droght and Autumn drizzle in Guizhou province, we explored two sowing methods: sowing green manure directly without overturning the land and sowing after plowing the soil to study their influence on the growth of Sativus Vicia 66-25 and the soil moisture.
     针对我省黄壤旱耕地质地粘重、耕性不良的特点,以及发生频率较高的秋旱和秋绵雨气候特点,我们研究了免耕直播和耕翻播种两种耕种方式对秋播66—25箭舌豌豆的生长发育及土壤含水量的影响。
短句来源
     Cinnamonazation mixed soil is the most fitting soil species. among sand loam soil ,small mixed soil, miry soil and cinnamonazation mixed soil for the growth of dioscorea opposita thunb, which is perfect in the aspects of soil texture ,soil structure, sand-clay proportion, soil tilth and soil nutrition, so the output and quality of dioscorea opposita thunb,is best.
     砂壤土、小两合土、淤土、褐土化两合土4个土种中,以褐土化两合最适宜怀山药的生长,其在质地、土壤结构、砂粘比例、土壤耕性、养分状况等方面均为理想,所产怀山药产量高,品质佳。
短句来源
  耕耘
     A preliminary experiment and analysis of tilth resistance of two-wing types of different sweeps mounted on the same revolving frame were made through modification of moving parameters in this paper.
     本文对同一回转刀盘安装不同数量双翼型刀铲的耕耘阻力,通过改变运动参数进行了初步试验分析。
短句来源
     The effect of raising machine speed upon tilth resist- ance and the ratio of power consumption is the same as that of reducing the revolutionary speed of sweep cylinder.
     提高机组速度,则对耕耘阻力、比功耗的影响与减少刀滚转速趋势一样。
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  tilth
North American potato production differs from that of Britain and continental Europe in that it is mostly carried out on light (sandy loam) soils permitting the use of large machinery and minimizing problems with soil tilth at planting and harvest.
      
The tilth index coefficient (average of three depths) of the forest site was significantly higher (0.717) than the cultivated forest (0.633) and thc deforested (0.573) sites.
      
Conversely, the destruction of the surface tilth by falling water drops had no effect on the rate of emergence of either wheat or oats.
      
The growth of cereals under soil conditions characteristic of an unstable tilth
      
The implications of these results are that grasslands can be managed to lessen the increase in atmospheric CO2 concentration, while also improving fertility (N-supplying capacity) and tilth of soil.
      
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All existing graphic as well as other methods of plow bottom surface design are empirical.For a derived approach,the instrinsic relations between the soil properties,tilth requirements,working regimes such as plowing speed and draft,the shape and parameters of the bottom sur-face etc have to be established.In trying to link these design factors together,in this paper,theproper turning of the furrow slice is mathematically described with the motion of an assignedtraverse section of the slice,and that part...

All existing graphic as well as other methods of plow bottom surface design are empirical.For a derived approach,the instrinsic relations between the soil properties,tilth requirements,working regimes such as plowing speed and draft,the shape and parameters of the bottom sur-face etc have to be established.In trying to link these design factors together,in this paper,theproper turning of the furrow slice is mathematically described with the motion of an assignedtraverse section of the slice,and that part of the spatial surface traced by the bottom side ofthat traverse section,the optinium shape of which is a parabola,is made the working surfaceof the plow bottom,with a mathematical expression in the form of(x,y,z)=f_1(x)y~2+f_2(x)y+f_3(x)z+f_4(x)=0.The tracing locus of a soil particle on the bottom surface is the inter-section of the bottom surface with a cylindrical surface of variable radius(with the soil parti-cle at the end of the radius during slice turning)and is represented in the form of(?)A differential geometrical analysis of the tracing locus of a soil particle on the bottom surfacegives some of the instrinsic relations of the design factors in question,and criteria equationsfor selection of those basic parameters of bottom surface such as the longitudinal length ofthe bottom surface,the plan-view angle of the share,shape and curvature of the bottom sideof the traverse section of the slice during turning erc are derived,curve equations representingthe inspection gauge templet is also derived;and finally,the procedure of the analytic methodin bottom surface design is scheduled.

190年前就已提出,对犁这样一种属于全人类具有长期广泛使用历史的重要工具,其曲面应该能用科学的标志——数学解析法来描述和设计。至今,国内外各种直元线、曲元线和其他设计法联同其参数选择仍然基本上属于经验式,因为都不能将所耕土壤的物理力学特性量、耕后要求达到的土垡状况、耕速阻力等工况与曲面形状曲面参数在设计中有机地联系起来。本文提出一种企图将这些因素联系起来的设计法。犁耕中土垡的运动仍用土垡剖面的翻转来描述。犁体曲面即为曲率在不断变化的土垡剖面底边线在翻转中扫描所成的空间曲面,其解析式为泛函ψ(x,y,z)=f_1(x)y~2+f_2(x)y+f_3(x)z+f_4(x)=0。土垡剖面底边任意点土粒在曲面上的运动迹线为以土垡剖面底边的底点为瞬时轴心,以从轴心至该任意点距离为半径的柱面与曲面的交线,其方程为(?)。通过对土粒在曲面上运动迹线的微分几何分析,建立了不同土壤在不同耕速下土垡合理翻转而阻力最小的几项曲面主要参数的选择判断式。导出了制作曲面时所需的各条样板曲线的方程式。最后规定了整个曲面设计的具体步骤。

The paper mainly discusses the formations, patterns, distributions, and harms of wind blown sand of Huang Huai Hai plain in Henan province, which are classified into flat alluvial sand of ancient river of Yellow River, wave sand, sand of sanddune and sandbank, and hard-mound sand cut by Yellow River. Comprehensive controls are biological control (plantation; grass protection; orchard development), water control, (sand flushed by Yellow River water; sand covered by Yellow River silt carrying water), agricultural...

The paper mainly discusses the formations, patterns, distributions, and harms of wind blown sand of Huang Huai Hai plain in Henan province, which are classified into flat alluvial sand of ancient river of Yellow River, wave sand, sand of sanddune and sandbank, and hard-mound sand cut by Yellow River. Comprehensive controls are biological control (plantation; grass protection; orchard development), water control, (sand flushed by Yellow River water; sand covered by Yellow River silt carrying water), agricultural control (green manure crops turned over into tilth top soil), engineering control (put clay which is under sand over sand; mixed sand and clay), and other control (intercrop jujube trees and oil crops; intercrop jujube trees and other fruit trees; diversified economy).

本文主要论述河南省境黄淮海平原地区风沙地的形成、类型、分布与危害。在类型上分为黄河古河道冲积平缓沙地、波状沙起伏沙地、沙丘沙垄沙地、黄河切割硬岗沙地。在综合治理上,采用生物措施(植树造林、育草封沙、发展果园等)、水利措施(引黄拉沙、引黄放淤等)、农业措施(如绿肥掩青等)、工程措施(如翻淤压、沙粘土互换等)其它措施(如枣油、枣果间作,多种经营等)

In order to find out an applying superphosphate method of convenience and higher efficiency for increasing grain yields of winter wheat, experiments have been carried out with two field plot tests and one greenhouse pot test and one group of observing roots in Baoding in 1989—1983. The main results are as follow: Under the condition of the medium-fertility soils with available P_2o_5 of 17. 6—18.8ppm, the grain yield of applying superphosphate 50—100jin/mu is statistically significant higher than non-applying...

In order to find out an applying superphosphate method of convenience and higher efficiency for increasing grain yields of winter wheat, experiments have been carried out with two field plot tests and one greenhouse pot test and one group of observing roots in Baoding in 1989—1983. The main results are as follow: Under the condition of the medium-fertility soils with available P_2o_5 of 17. 6—18.8ppm, the grain yield of applying superphosphate 50—100jin/mu is statistically significant higher than non-applying it, when methods of applying are different, the difference of the grain yields between the placing superphosphate into 6—10cm soil below surface and the ploughing the fertilizer into the tillth are not statistically significant, i. e., is not marked. Presumably because the wheat roots, especially seminal roots, expand rapidly and deeptly, and absorb phosphorus powerfully. Therefore, in Present,ploughing superphosphate into the soil tilth is a well method of convennience and higher efficiency.

本研究结果表明:在肥力中等,含有效磷(p_2o_6)17.6—18.8PPm的土壤上,每亩施过磷酸钙50—100斤,小麦籽粒产量显著提高的条件下,在耕后播种前把磷肥浅层施入6—10厘米土层与结合耕地翻入整个耕层,小麦冬前生长量和籽粒产量差异不显著。从而重新肯定了耕翻入整个耕层仍为过磷酸钙简易高效的施肥方法,耕后浅施徒劳无益。

 
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