检索结果-南通市图书馆

Limited impacts of occasional tillage on dry aggregate size distribution and soil carbon and nitrogen fractions in semi-arid drylands

引用

International Soil and Water Conservation Research 2024年第1期12卷 96-106页

作者： Wooiklee S.Paye Vesh R.Thapa rajan ghimire New Mexico State University Agricultural Science CenterClovisNM88101USA New Mexico State University Department of Plant and Environmental SciencesLas CrucesNM88003USA

Tillage management that minimizes the frequency and intensity of soil disturbance can increase soil carbon(C)and nitrogen(N)sequestration and improve the resilience of dryland cropping systems,yet the impact of occasional disturbance on soil aggregate formation and the soil organic carbon(SOC)storage within aggregates has not been studied *** evaluated the effect of four tillage management practices on soil dry aggregate size distribution,aggregate-protected C and N,mineral-associated organic matter carbon(MAOM-C),particulate organic matter carbon(POM-C),and corn(Zea mays L.)and sorghum(Sorghum bicolor(L.)Moench)yields in a semi-arid dryland cropping *** included conventional tillage(CT),strip-tillage(ST),no-tillage(NT),and occasional tillage(OT)management in a corn-sorghum *** macro-aggregates were 51-54%greater under ST,NT,and OT,while small and micro-aggregates were greater in *** tillage reduced soil aggregate-associated C by 28-31%in macro-aggregates and 47-53%in small aggregates at 26 months(M)sampling compared to ST,NT,and *** clay+silt fraction,CT had 14-16%,21-26%,and 36-43%less SOC at 7,14,and 26M samplings,respectively,than ST,NT,and *** associated N was generally similar under ST,NT,and OT,which was greater on average than *** MOAM-C and POM-C under ST,NT,and OT were generally greater than respective SOC fractions under CT at 19 and 26 M after OT *** and sorghum yields were similar among tillage systems in 2020,but greater under ST,NT,and OT than CT in *** results suggest that while frequent intensive tillage can lower SOC and N storage,a single stubble mulch occasional tillage after several years of NT does not lead to soil C and N losses and soil structural instability in semi-arid drylands.

关键词： Conventional tillage Occasional tillage Aggregate associated carbon Mineral associated organic matter carbon(MAOM-C) Particulate organic matter carbon(POM-C)

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Tillage, crop residue, and nutrient management effects *** organic carbon in rice-based cropping systems： A review

引用

Journal of Integrative Agriculture 2017年第1期16卷 1-15页

作者： rajan ghimire Sushil Lamichhane Bharat Sharma Acharya Prakriti Bista Upendra Man Sainju Agricultural Science Center New Mexico State University NM 88101 USA Soil Science Division Nepal Agricultural Research Council Khumaltar Nepal Department of Natural Resource Ecology and Management Oklahoma State University OK 74078 USA Columbia Basin Agricultural Research Center Oregon State University OR 97801 USA Northern Plains Agricultural Research Lab USDA-ARS MT 59270 USA

Soil organic carbon （SOC） sequestration is one of the major agricultural strategies to mitigate greenhouse gas （GHG） emissions, enhance food security, and improve agricultural sustainability. This paper synthesizes the much-needed state- of-knowledge on the effects of tillage, crop residue, and nutrient management practices on SOC sequestration and identifies potential research gap, opportunities, and challenges in studying SOC dynamics in rice （Oryza sativa L.）-based cropping systems in South Asia, mainly in Bangladesh, Bhutan, India, Nepal, Pakistan, and Sri Lanka. Improved management prac- tices such as reduced- and no-tillage management, nitrogen （N） fertilizer and farmyard manure （FYM） application, and crop residue addition can improve SOC accumulation. Positive effects of no-tillage, crop residue addition, N addition through manure or compost application, and integration of organic and chemical fertilizers on SOC accumulation in rice-based cropping systems have been documented from South Asia. However, limited data and enormous discrepancies in SOC measurements across the region exist as the greatest challenge in increasing SOC sequestration and improving agricultural sustainability. More research on SOC as influenced by alternative tillage, crop residue, and nutrient management systems, and development of SOC monitoring system for existing long-term experiments will advance our understanding of the SOC dynamics in rice-based cropping systems and improve agricultural system sustainability in South Asia.

关键词： carbon mapping carbon sequestration crop residue no-tillage rice-wheat system

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

黄土高原绿肥填闲种植的水分与产量效应:Meta分析

引用

中国生态农业学报（中英文） 2021年第11期29卷 1879-1892页

作者：张少宏王俊 rajan ghimire 邢文超胡映明张南南西北大学城市与环境学院西安710127 陕西省地表系统与环境承载力重点实验室西安710127 中国科学院教育部水土保持与生态环境研究中心杨凌712100 New Mexico State University Agricultural Science Center at ClovisNM 88101USA

绿肥填闲种植是黄土高原旱作农业区一项历史悠久的种植方式,但受降水资源限制,绿肥种植可能会增加土壤水分消耗,进而影响后茬粮食作物的产量。本研究基于46篇黄土高原绿肥相关文献数据,采用整合分析(Metaanalysis)方法探究绿肥种植对休... 详细信息

绿肥填闲种植是黄土高原旱作农业区一项历史悠久的种植方式,但受降水资源限制,绿肥种植可能会增加土壤水分消耗,进而影响后茬粮食作物的产量。本研究基于46篇黄土高原绿肥相关文献数据,采用整合分析(Metaanalysis)方法探究绿肥种植对休闲期降水储存效率(PSE)、粮食作物播种时土壤储水量(SWSP)、粮食作物产量、蒸散量(ET)和水分利用效率(WUE)的影响。结果表明,与裸地休闲相比,绿肥种植系统PSE、SWSP和ET分别降低28.28%、4.93%和2.51%(P<0.05),而后茬粮食作物产量和WUE平均提高2.37%和8.97%(P<0.05)。绿肥填闲种植的水分和产量效应随绿肥翻压至后茬粮食作物播种间隔时间、绿肥生物量以及气候条件而发生变化。PSE、SWSP和后茬粮食作物产量随豆科绿肥翻压至后茬粮食作物播种间隔时间的延长均呈先增加后减少变化,指标的效应量(response ratio,RR)均在间隔时间约13 d时达最大。后茬粮食作物产量和WUE的RR与豆科绿肥生物量之间存在二项式相关,并分别在绿肥生物量为2200 kg·hm^(-2)和3100 kg·hm^(-2)左右时达最大。总体来看,黄土高原地区种植绿肥虽然降低了土壤水分,但对后茬粮食作物产量形成和水分利用具有显著的促进作用,提前13 d左右进行绿肥翻压、控制豆科绿肥生物量在2200~3100 kg·hm^(-2)能够有效减缓对土壤水分的负面影响。

关键词：绿肥土壤水分产量水分利用效率整合分析

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Formulation,in-vitro Evaluation and Dissolution Enhancement of Griseofulvin by Solid Dispersion Method

引用

Journal of Pharmacy and Pharmacology 2022年第4期10卷 125-131页

作者： Gopal Pokhrel Bikash Dani Srijana Shrestha Rakshya Chaudhary Ramesh Dhami Barnabas Sunuwar Sharad Pudasaini Vijay Yadav Lalit Mohan Pant rajan ghimire Department of Pharmacy Karnali College of Health SciencesKathmanduNepal Department of Pharmacy HOPE International CollegeLalitpurNepal Deurali-Janta Pharmaceuticals Pvt.Ltd. KathmanduNepal

Introduction:Griseofulvin is an antifungal drug belonging to Biopharmaceutical Classification System(BCS class II)having low ***:To formulate,evaluate and enhance the dissolution of poorly water soluble drug Griseofulvin by using solid dispersion ***:Six formulations were prepared by solid dispersion method using Polyethylene Glycol(PEG 6000)125 mg,0 mg,62.5 mg,100 mg,25 mg,150 mg and superdisintegrants Crospovidone 0 mg,125 mg,62.5 mg,100 mg,25 mg,150 mg in all batches ***:Satisfactory results were obtained from evaluation of physical characteristics of Griseofulvin tablets including:carr’s compressibility index(17.5±0.19%to 11.76±0.67%),Hausner ratio(1.21±0.01 to 1.13±0.02)and post compression parameters including:thickness(5.16±0.02 mm to 4.57±0.19 mm),friability(0.024%to 0.322%),hardness(4±0.28 kg/cm^(2)to 5±0.57 kg/cm^(2)),disintegration time(14-870 seconds).Conclusions:F3 was best formulation among all formulated batches with in-vitro drug release 30.05%in 10 minutes,69.21%in 30 minutes and 97.11%in 45 *** indicated that formulation F3 batch with PEG 6000 of 62.5 mg and crospovidone 62.5 mg showed increased dissolution.

关键词： Griseofulvin formulation solid dispersion solubility evaluation

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：