| 1. | Study on the characters of heat of soil and organo - mineral complexs in cumulic cinnanon soil under different fertilization conditions
土不同施肥条件下土壤及其胶散复合体热特性研究 |
| 2. | Particle size fractionation of organic - mineral complexes in red soils planted flue - cured tobacco under different fertilization conditions in yunnan
云南植烟红壤不同施肥条件下有机无机复合体颗粒大小分组研究 |
| 3. | Fertigation by drip irrigation as an advanced technology to control the supply of water and nutrients has been applied by other countries in recent years
滴灌施肥作为一种先进的水分调控技术，近年来国外已开始广泛采用，但对滴灌施肥条件下肥料养分在土壤中迁移转化规律的了解尚十分有限。 |
| 4. | Effects of 20 years continuous long - term application of organic manure , chemical fertilizer and organic - chemical combined fertilizer on the results of soil nutrients variation were studied at yucheng experiment area of shandong province
摘要以在山东禹城试验区持续近20年的定位试验为依据，对长期施用有机肥、无机肥、有机无机结合等不同施肥条件下的土壤养分演变进行了系统总结。 |
| 5. | ( 3 ) the amount of nitrogen leached was in the decreasing order as no3 - fertilizer > urea > nh4 + - fertinzer , and the main form of n leached was the n fertilizers added . the amount of nitrogen leached from sand soil exceed in that from clay soil
( 3 )在滴灌施肥条件下，三种氮肥(硝态氮、铵态氮和尿素态氮)在两种质地的土壤中的淋失量均是硝态氮肥尿素铵态氮肥，淋失的氮素主要为肥料氮。 |
| 6. | Studying on the mechanism of nitrogen transport and transformation under the conditions of fertilization and irrigation with sewage effluent is very important for utilization of sewage effluent and fertilizer and pollution control . based on laboratory and field experiment and numerical simulation , nitrogen transport and transformation has been investigated in this dissertation
污水灌溉和施肥条件下，氮素在土壤与作物系统中迁移转化规律的研究，对于合理利用污水资源和合理施肥，最大限度提高水分和养分的利用率，减少硝态氮淋洗风险，具有十分重要的意义。 |
| 7. | In field study , the expenment on nitrogen transport and transformation in soils with different irrigation ( with both ground water and sewage effluent ) and fertilization levels has been conducted . with considenng the n - uptake , nitrification and demtrification processes , a model for describing no2 - - n transport and transformation in unsaturated soil has been applied . results show that , the n03 + - n accumulating in soil is contributed more by fertilization but lees by irrigation with sewage effluent , and the model can be used to simulate no3 - - n transport in soils
在室外进行了不同清污水灌水量与施肥条件下氮素迁移转化试验，同时进行了考虑根系吸收，硝化和反硝化的田间非饱和no _ 3 ~ - ? n迁移转化模型的数值模拟，研究结果表明与施肥相比，污水灌溉对土壤中no _ 3 ~ - ? n累积的贡献较小，所建立模型可用于模拟no _ 3 ~ - ? n在土壤中的迁移。 |
| 8. | However , the movement and transformation of n in soil under fertigation remains unclear . the methods of simulation experiment and culture experiment were used to study the movement and transformation of n in soil under fertigation by drip irrigation . the main experimental results were shown as folio wings : ( 1 ) the water infiltration under drop irrigation is a point infiltration ; and the soil moisture in vertical and horizontal directions was increased with the irrigation time , and the movement rate were decreased with the irrigation time
本研究采用室内模拟试验和生物培养试验相结合的方法，研究了在滴灌施肥条件下，化学氮肥施入土壤后的迁移、转化规律以及对作物生长的效应，获得了以下主要结论： ( 1 )滴灌条件下水分以点源入渗土壤，水平和垂向的湿润锋均随入渗时间的增加而逐渐变大，在入渗开始阶段湿润锋的推进速率较大，随入渗时间的延长，湿润锋的推进速率逐渐变慢。 |
