查询词典 fertilization cone

Under conventional N fertilization and irrigation condition, N2O emissions during 2001-2002 and 2002-2003 in winter wheat and summer maize rotation system were 1959 g N hm-2 and 1250 g N hm'2, respectively; and 68%-86% of N2O emission occurred in summer maize growth season, the emissions mainly occurred in 2 weeks after N fertilization and irrigation. The highest flux rates were 5.06 mg m-2 d-1 and 5.60 mg m-2 d-1 in the rotation period of 2001-2002 and 2002-2003, which were happened at the ten-extended leaf stage in summer maize season when top-dressing N fertilizer was applied.

在冬小麦／夏玉米轮作体系农民传统的水肥管理处理中，2001-2002和2002-2003两个轮作周期内测得的N_2O的排放量分别为1959 gN hm~(-2)和1250 gN hm~(-2)，N_2O的排放主要集中在每次施肥和灌水之后的两周内，其中夏玉米十展叶期追肥后两周内N_2O的排放速率最高，2002年和2003年分别达到5.06 mg m~(-2)d~(-1)和5.60 mg m~(-2)d~(-1)。

Compared with conventional irrigation, APRI treatment during different growth stages of tobacco saved irrigation water by 10.6% under lower fertilization and 7.1% under higher fertilization, respectively.

与常规灌溉相比，不同生育期APRI处理低肥时平均节水10.6%，高肥时平均节水6.1%，低肥时烟叶WUE平均提高2.3%。

Economic and reasonable fertilization was better for improving fertilizing profits and reducing environmental press from unreasonable fertilization.

化肥市场供需调控直接关系到农业生产是否有充足的肥料，农户能否在作物生产第一时间用到化肥，因此，区域化肥经济合理施用与市场供需平衡对于保障区域农业化肥稳定供给具有积极意义。

This paper took bamboo forest which is in the district of Huangshan in Anhui Province without human disturbance as the research object, making research on dynamic changes of chemical properties and enzyme activities of rhizosphere soil at different growth stages of bamboo, aiming at providing theoretical basis for precise fertilization in root region of bamboo, and improving fertilizer efficiency. At the same time, we made an analysis about the effects of fertilization on bamboo seedlings, and established the DRIS nutritional diagnosis to provide theoretical basis for the management of seedling bamboo nutrition. The main conclusions are as follo...

本文以安徽省黄山区无人为经营毛竹林为研究对象，对其不同生长阶段根际土壤化学性质、酶活性等动态变化进行了研究，以期为毛竹根区精准施肥，提高肥效提供理论参考；同时，分析了毛竹实生苗苗期施肥效应，建立了DRIS营养诊断方法，旨在为指导毛竹苗期营养管理提供理论依据。

An exstensive research on the calculation formulas for the abutment cone slope on skewed bridges is conclucted.Calculation formulas of key parameters on slope curve are derived through analytic calculation of ellipse curve at slope bottom.The values of parameters are discussed and various forms of cone slope and curve at slope bottom are detailed.

以斜交桥梁桥台锥坡为锥坡的一般形式展开较深入的研究，通过对坡脚椭圆曲线的解析计算，推导得出坡脚曲线各控制参数的计算公式，并对其取值进行讨论，详细说明了锥坡和坡脚曲线的各种形式；进而推导了斜交锥坡的体积、护坡体积、表面积和基础体积的计算公式。

Correlation of drillability anisotropy index of the roller cone bit and PDC bit, the difference between drillability of the roller cone bit in perpendicular and horizontal directions of the bedding plane with the P-wave velocity anisotropy coefficient are studied respectively by means of mathematical statistics. A mathematical model is established for predicting drillability anisotropy index by using P-wave velocity anisotropy coefficient.

用数理统计方法研究分析了牙轮钻头岩石可钻性各向异性指数、牙轮钻头垂直于和平行于地层层面方向岩石可钻性差值和PDC钻头岩石可钻性各向异性指数与纵波波速各向异性系数的相关关系，建立了用纵波波速各向异性系数评价地层可钻性各向异性的模型。

Collier Cone, a cinder cone, at the north base of North Sister.

科利尔圆堆，一个煤渣堆，在三姐妹山北峰的北侧山脚。

This paper introduces a new method of turning circular cone to improve the precision of finished cone, and cutting down the time of adjusting angle.

介绍了一种新的车削圆锥体的方法，该方法使加工出的锥体精度提高，并可缩短角度调校时间。

A plane curve formed by the intersection of a right circular cone and a plane parallel to an element of the cone .

一个平面与正圆锥体的底部相交而形成的不闭合的曲线。

A plane curve formed by the intersection of a right circular cone and a plane parallel to an element of the cone.

具有抛物面主镜和双曲面次镜的一种折射式望远镜；光线被集中到主镜中心的孔径。

But GST= 0.156, Nm=1. 588. As a result, the foundation of Youyongchi Avicennia marina population was the result of the migration of hypocotyles and human factors.

这项工作可以为海岸防护林中新引进种类的判定以及为研究种群建立者效应方法的确定提供科学依据。

The two-dimensional CDRC-ADI-FDTD update equations for collision unmagnetized plasma are induced. The unconditional stability of the CDRC-ADI-FDTD formulation for collision unmagnetized plasma is obtained by the examples.

推导了碰撞非磁化等离子体中的二维CDRC-ADI-FDTD迭代公式，并用算例验证了碰撞非磁化等离子体CDRC-ADI-FDTD算法也是无条件稳定的。