沼液对地膜小麦根系及产量影响研究     

任广鑫  邱凌  杨改河  聂俊锋 《农业工程学报》2003,19(7):83-85

沼液浸种的地膜小麦具有合理的产量结构，比地膜小麦增产9.88%，比露地小麦增产67.65%，苗期着重促进了根系的发育，中后期更快地促进了地上部的生长发育，使植株的抗逆性增强。喷施叶面肥均表现为增产，其中KH₂PO₄效果最好，增产幅度11.94%～13.92%，其余依次为麦丰乐、沼液、红苹果2号，增产幅度不足6%，同时提高了株高、成穗数、穗粒数和粒重。  相似文献   

宽幅渗水地膜覆盖集雨式仿丰产沟耕作栽培技术效果研究   总被引：1，自引：3，他引：1  

殷海善 《水土保持学报》2005,19(1):196-199

宽幅渗水地膜覆盖集雨式仿丰产沟耕作栽培技术(简称"宽膜集雨耕作技术")的核心技术是宽幅地膜和"V"型种植。多年的小区试验和大田示范研究表明,宽膜集雨耕作技术栽培使土壤含水量、降水利用率和生产率都显著提高;作物生育进程明显提前;农田单产提高20%左右。增产的原因是"V"型膜面结构集流效率高,同时宽膜土壤的地积温、单株植株的增温面积也增加。此外,还有土壤板结因素降低等原因。  相似文献   

旱地豌豆新品种定豌2号丰产栽培综合配套技术研究     

王思慧 《干旱地区农业研究》2006,24(4):108-112

在旱农区农田生态条件下,采用常规与二次回归正交结合的设计方法,多点同步研究定豌2号高产与密度、氮磷施用量及配比间的关系和相关效应,钼肥、保水剂高效施用技术,并在试验基础上同时进行生产示范验证。根据试验示范结果,选用相应分析程序进行计算机模拟寻优,得到定豌2号产量1 950~2 653 kg/hm2的技术方案65套。该方案95%置信域:播种量109.5~148.5万株/hm2,施N 45~64.5 kg/hm2,P2O5112.5~147kg/hm2,N∶P2O5约为1∶2.37,沟施植物保水剂7.5 kg,每1 000 g种子用钼酸铵4 g拌种。  相似文献   

提高旱农地区甘草田间出苗率的试验分析   总被引：3，自引：2，他引：1  

王立  张继义  李家恒  孔令大 《草业科学》2001,18(1):19-21

通过随机区组田间试验的方法，对如何提高甘草田间出苗率进行了研究。试验证明：甘草的田间出苗率与播种深度呈负相关，若底墒好，播后不浇水，播深2．5－3．0cm，可提高其田间出苗率；若底墒差，播后浇水，播深1．5－2．0cm，亦能提高其田间出苗率。在新垦重盐碱地播种甘草，用生长素4号和1号拌种，可分别提高田间出苗率2．9倍和2．6倍。播后3d浇水比播后16d浇水的田间出苗率提高29．5％。  相似文献   

甘肃河东旱作小麦农田干旱监测预警服务系统研究   总被引：2，自引：0，他引：2  

杨启国  张旭东  杨兴国  刘宏谊 《干旱地区农业研究》2004,22(3):186-191

通过对甘肃河东地区当前作物旱情指标的分析,选取了依据农田水量平衡原理而建立的作物水分供需比作为作物旱情指标,利用田问试验资料,建立了旱作小麦农田干旱监测预警指标模型,并确定出小麦旱情分级标准。以此为基础,编制了甘肃河东旱作小麦农田干旱监测预警系统软件,简要介绍了该系统的结构、功能及操作环境,并对预测精度问题进行了说明。  相似文献   

不同播期对旱作谷子生长及产量的影响   总被引：4，自引：0，他引：4  

赵海超  曲平化  龚学臣  陈春艳 《河北北方学院学报(自然科学版)》2012,28(3):26-30

目的研究旱作条件下不同播期对谷子生长和产量的影响。方法通过对谷子生育时期、叶面积、株高和叶、茎、穗干重以及产量指标的测定,确定谷子的最佳播期。结果随着播期的延迟谷子生育期变短;叶、茎随着播期的延迟生长速率变慢、衰退速率变慢;播种期过早谷子前期生长速率较快、播种晚的谷子后期生长较快;穗干重随着播期的延迟积累变快,千粒重随着播期的延迟呈下降趋势;穗粒数、籽粒产量和产草量均以5月23为播期最高。结论张家口地区谷子最佳播期为5月23日。  相似文献   

Relationships between Agronomic Practices, Soil Chemical Characteristics and Striga Reproduction in Dryland Areas of Tanzania     

Kudra Abdul  George N. Chemining＇wa  Richard N. Onwonga 《农业科学与技术》2012,(10):1134-1141

  相似文献   

Floristic diversity, regeneration status, and vegetation structure of woodlands in Metema Area, Amhara National Regional State, Northwestern Ethiopia     

Haile Adamu Wale  Tamrat Bekele  Gemedo Dalle 《林业研究》2012,23(3):391-398

We studied woodland vegetation in broad-leaved deciduous woodlands of Metema in northwestern Amhara regional state, Ethiopia Our objective was to describe plant species composition, diversity, regeneration status, and population structure by a selective approach with asystematic sampling design. A total of 74 quadrats (each for 25 m × 25 m,spaced at intervals of 150 200 m) were sampled along established transect lines following the homogeneity of the vegetation. Vegetation data including cover-abundance, height, diameter at breast height (DBH), and numbers of seedlings and saplings of woody species were analyzed using Excel spreadsheet, Shannon Weiner diversity index, and PAST version 1.62. A total of 87 vascular plant species of 74 genera and 36 families were recorded. The dominant family was Fabaceae represented by 16(18.39 %) species of 13 genera. Shannon Weiner diversity and evenness were 3.67 and 0.82, respectively, which showed that the area was endowed with rich floral diversity evenly distributed. The vegetation structure, as quantified by cumulative diameter class frequency distribution,plotted as an interrupted inverted-J-shape pattern with a sharp decreasein the 2nd diameter class. This indicated poor vegetation structure. The diameter classes frequency distributions of selected species plotted infour general patterns i.e., interrupted Inverted-J-shape, J-shape,Bell-shape and Irregular-shape. In conclusion, although the area showedhigh floral diversity and evenness, woody species including Sterculea setigera, Boswellia papyrifera, and Pterocarpus lucens showed lowest recruitment of seedlings and saplings.  相似文献   

渭北旱原优势农产品发展战略研究   总被引：1，自引：0，他引：1  

任广鑫  冯永忠  杨改河  胡良温 《干旱地区农业研究》2005,23(2):184-187

在剖析渭北旱原自然资源和优势农产品发展背景的基础上,论述了加入WTO对该区优势农产品发展的影响,提出了大力发展优势农产品加工业、产业结构调整和升级、提高科技对优势农产品的贡献率、支持优势农产品质量安全体系建设、加快生态农业模式的推广普及等综合发展战略途径来增加区域优势农产品的国际竞争力和促进农民的增收。  相似文献   

Studying the function of ecosystem in preventing aeolian dust emission in the dryland areas of China     

Xuesong Wang  Carla Sofia Santos Ferreira 《European Journal of Soil Science》2023,74(3):e13371

Aeolian dust emissions can cause many environmental hazards, like accelerating land degradation and desertification, polluting air, harming human health, and so on. The dryland areas of China (DAC) are hot spots of aeolian dust emissions. To date, many efforts have been paid to researching dust emissions processes and effects, but research studies on ecosystems' function in preventing dust emissions are still very limited. In this study, we investigated the function of DAC ecosystems in preventing dust emissions, and the corresponding driving factors through integrated wind erosion modelling system (IWEMS) modelling. The main results indicate that: (1) from 2001 to 2020, the ecosystems of DAC prevented the emission of dust ~40,554 Tg, approximately 15 times as much as the total actual dust emission (~2776 Tg); (2) the function of DAC ecosystems in preventing dust emissions was relatively strong in spring and winter; (3) grassland ecosystems had the strongest function in preventing dust emissions among all the land cover types, avoiding the emission of dust ~20,857 Tg over 2001–2020; (4) dust emission prevention function provided by the DAC ecosystems benefits almost every region of China, which provides a theoretical basis for formulating ecological compensation policies; and (5) the changes in dust emissions were dominated by wind speed in most areas of DAC.  相似文献