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31.
Performance of rainy season greengram as influenced by land configuration and phosphorus application
B. G. Shivakumar B. N. Mishra H. M. Thippeswamy S. S. Balloli 《Archives of Agronomy and Soil Science》2013,59(3-4):371-379
A field experiment was carried out for 2 crop years (July‐October) at the Indian Agricultural Research Institute, New Delhi to study the effect of land configuration and phosphorus levels on the growth and yield of rainy season greengram under limited irrigation facility. The crop sown on 2 meter wide broad bed and furrow (BBF) showed higher growth attributes, nodulation, yield attributes and yield compared to flat bed (FB) sowing. Application of 30 and 60 kg P2O5ha‐1 showed significant increase in growth attributes, nodulation, yield attributes and yield as compared to no phosphorus application. The moisture status in the soil determined the optimum dose of phosphorus needed for greengram. The combination of BBF sowing and application of 60 kg P2O5 ha?1 recorded the highest grain yield among all the combinations of land configuration and phosphorus levels. 相似文献
32.
漯河市沙澧河公园植物配置模式应用技术探讨 总被引:1,自引:0,他引:1
在漯河市沙澧河公园植物营造过程中,科学筛选适宜品种,充分利用乡土树种,进行合理配置,营造连续性滨河公园园林景观,构建地带性植物群落,既美化了环境,也保证了生态平衡。 相似文献
33.
The factors responsible for widespread declines of grassland birds in the United States are not well understood. This study,
conducted in the short-grass prairie of eastern Wyoming, was designed to investigate the relationship between variation in
habitat amount, landscape heterogeneity, prey resources, and spatial variation in grassland bird species richness. We estimated
bird richness over a 5-year period (1994–1998) from 29 Breeding Bird Survey locations. Estimated bird richness was modeled
as a function of landscape structure surrounding survey routes using satellite-based imagery (1996) and grasshopper density
and richness, a potentially important prey of grassland birds. Model specification progressed from simple to complex explanations
for spatial variation in bird richness. An information-theoretic approach was used to rank and select candidate models. Our
best model included measurements of habitat amount, habitat arrangement, landscape matrix, and prey diversity. Grassland bird
richness was positively associated with grassland habitat; was negatively associated with habitat dispersion; positively associated
with edge habitats; negatively associated with landscape matrix attributes that may restrict movement of grassland bird; and
positively related to grasshopper richness. Collectively, 62% of the spatial variation in grassland bird richness was accounted
for by the model (adj-R2 = 0.514). These results suggest that the distribution of grassland bird species is influenced by a complex mixture of factors
that include habitat area affects, landscape pattern and composition, and the availability of prey. 相似文献
34.
鉴于目前普遍的园林景观建设,针对绿地景石布置,从选材、设置理念到布置方式逐一进行了探讨,为绿地景石的布置设计提供参考。 相似文献
35.
以塔里木河流域为例,探讨了区域之间的水权配置流程,主要包括水权配置的准备、配置草案的拟定和配置方案的确定3个子程序。配置流程强调透明性、民主性和互动性。民主协商和公众参与有助于配置过程的顺利进行和配置结果的贯彻落实。 相似文献
36.
樊冬温 《林业机械与木工设备》2005,33(5):20-22
森林培育装备配属过程控制是森林培育实施全面质量管理的重要组成部分。配属过程包括策划、信息采集、选型、动力计算和效益分析、设计评审、验证和确认及配属的更改。森林培育装备配属过程控制能够合理有效地利用资金,保证装备质量的可靠性和适用性。 相似文献
37.
通过对中山公园实地调研,对园林植物种类、生活型、生态型和观赏特性进行了分析与总结,结果表明:中山公园植物总共162种,隶属于69科129属;具有亚热带地域风味以及岭南风情,植物群落布设自然合理,既符合适地适树的科学原则,也具有外来树种与乡土树种相结合等特点;存在有乡土树种种类少,人类活动与行为对植物景观造成的影响较大,公园的养护管理不到位以及特色植物菊花的配置形式简单等问题;因此在探讨植物种类选取的科学性基础上,从科学性、艺术性、生态性等角度出发,提供了一些优化建议。 相似文献
38.
黄晓剑 《中南林业科技大学学报(自然科学版)》1991,(2)
机构的第2类可动性。是机构分析与综合所要探讨的基本问题之一。本文对一般形式的空间RRRSR五杆机构的可动性进行分析。通过拆开运动副,分析运动轨迹,根据其雅可比矩阵奇异获得各位形分支的边界后,采用拓朴变换原理,讨论得出该机构的装配条件和连架杆的运动情况。为空间多杆机构的第2类可动性分析,提供了一条方便、实用的途径。 相似文献
39.
Takeshi Katayama Jyoji Tsutsui Kazuo Tsueda Takao Miki Yasuhiro Yamada Murao Sogo 《Journal of Wood Science》2000,46(6):458-465
When (±)--oxo-guaiacylglycerol--(vanillic acid) ether (1) is degraded byFusarium solani M-13-1, the-ketone is initially reduced to giveerythro andthreo guaiacylglycerol--(vanillic acid) ethers (2), arylglycerol--aryl ethers, both of which are enantiomerically pure. The absolute configuration in each2 was determined by Mosher's method; the products were converted to,-di-(R)--methoxy--trifluoromethylphenylacetates (MTPA esters) (3) oferythro (-)- andthreo (+)-veratrylglycerol--(methyl vanillate) ethers (3), whose1H nuclear magnetic resonance (NMR) spectra were examined and compared with those of four di-(R)-MTPA ester (3) diastereomers from chemically synthesizederythro (±)-3 andthreo (±)-3. To assign the- and-MTPA-OCH3 peaks, the1H NMR scans of several compounds that have substructures of 3 and their 3,4,5-trimethoxyphenyl analogues were examined. When a racemic alcohol reacts with (R)-MTPA to give a pair of (R)-MTPA ester diastereomers, the value was defined as the absolute value of the difference in the1H chemical shifts of the peak between the diastereomers. It was found that the values of-MTPA-OCH3 were larger than those of-MTPA-OCH3 owing to a shielding effect of the veratryl ring located on the-MTPA-OCH3, and that the-MTPA-OCH3 peaks in the 3,4,5-trimethoxyphenyl compounds shifted downfield relative to those in the veratryl compounds. On the basis of the1h NMR data of (R)-MTPA esters, the absolute configuration of the four chemically prepared diastereomers (3) were determined. The catabolicerythro
3 [fromerythro (-)-3] andthreo
3 [fromthreo (+)-3] were identical to (R, S, R)-erythro
3 and (R, S, S)- threo
3, respectively. An hydrogen species in the fungal reduction would attack the-ketone fromre-face of both (R)-1 and (S)-1, givingerythro (S, R)-2 andthreo (S, S)-2, respectively.Part of this paper was presented at the 33rd Lignin Symposium, Tsukuba, November 1988 相似文献
40.
文章在分析宁夏生态经济型林业发展现状的基础上,以生态学、恢复生态学和生态经济学为理论基础,围绕“生态”“经济”两条主线,以林业资源保育和增加植被盖度为切入点,由北向南将宁夏构建为3个林业生态功能区,即宁夏干旱带贺兰山及引黄灌溉绿洲生态网络体系建设区、宁夏中部干旱风沙带灌草配置区、宁夏南部半干旱带水土保持和水源涵养林区,实行多林种、树种,多序列的资源优化配置,以期形成产出效益的多样性和受益的社会性。 相似文献