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玉米不同茎节消化性指标与全茎叶干物分解率相关性分析 总被引:3,自引:0,他引:3
对不同玉米品种茎节消化性状进行了分析,从不同茎节茎、叶、茎叶的干物分解率和糖分含量与全茎叶干物分解率的相关性看,雌穗着生节向上和向下2~3节位的茎、茎叶与全茎叶干物分解率呈高度相关,不同节位叶的干物分解率、糖分含量与全茎叶干物分解率之间相关较低或无相关性。以此为依据,可用速效测糖仪测定雌穗节附近茎或茎叶的糖分含量,或测定此部分的干物分解率,进而推测全茎叶的干物分解率,在消化性状选育上达到简便、快速、经济、有效的选择目的。 相似文献
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以全球红葡萄为试材,研究赤霉素对果实中糖分积累、含酸量、单粒重及单穗重的影响。结果表明:经处理的果实在发育过程中总糖含量变化趋势与对照基本一致,糖分的含量基本呈"S"形曲线积累;含酸量的减少趋势与对照也基本一致,含酸量呈倒"S"形曲线减少。经赤霉素处理后,葡萄果实的果粒重、穗重明显增加,含酸量也有所增加,且随处理浓度的增大,含糖量呈现一定的减少趋势。 相似文献
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甜玉米具有独特的香、甜风味和营养品质,深受消费者青睐。甜玉米品种因所带隐性基因种类不同,分为普甜型和超甜型两种类型。在乳熟期籽粒含糖量为12%~18%,成熟时由于糖分未能及时转化为淀粉,故干燥后籽粒皱缩。甜玉米一般用于嫩穗鲜食。 相似文献
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龙眼葡萄贮藏保鲜技术 总被引:1,自引:0,他引:1
王柯芸 《农产品加工.学刊》2008,(11):18-19
龙眼葡萄,穗粒呈紫红色,皮薄而透明,果汁糖分含量高,吃起来味甜甘美,广泛分布于河北张家口、山西清徐等地,龙眼葡萄因其果粒似龙的眼睛而得名,素有“北国明珠”之美誉。采用适当的贮藏保鲜措施,即可延长龙眼葡萄的市场供货期,从而实现经济效益与社会效益双丰收。 相似文献
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本试验选用不同基因型甜高粱为材料,通过田间试验和室内检测方法,研究了不同基因型甜高粱品种的糖分积累规律,结果表明:(1)不同基因型甜高粱品种糖分积累规律的总趋势是从出苗至拔节期几乎不积累糖分;拔节至抽穗阶段开始积累糖分;抽穗至成熟期糖分积累达到高峰。(2)在同一播期条件下,不同基因型甜高粱其进入各个生育阶段的时间和持续天数不同,其在同一个生育阶段里的糖分积累量也不同。(3)同一个品种在不同的生育阶段中所积累的糖分总量不同。因此,欲求增加甜高粱的糖分含量,就须选含糖量较高的品种,并在糖分积累期采取相应栽培措施,促进其糖分积累。 相似文献
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从不同营养生长积温分蘖间的差异探讨小麦分蘖成穗的生理原因 总被引:5,自引:0,他引:5
运用营养生长积温对冬小麦分蘖的生长发育特点及其C、N、P代谢状况进行分组研究表明:①京郊小麦生产中分蘖的有效营养生长积温临界值约为250℃,营养生长积温不足175℃的冬前、春生蘖群很难成穗。②分蘖发育成穗及其穗部性状的改良与起身拔节阶段分蘖体内的C、N代谢水平密切相关。在良好N素代谢基础上增加拔节期间分蘖体内的糖分积累既有利于分蘖成穗率的提高,也有利于分蘖穗部性状的改善。③不同蘖群间,C素代谢优势始终表现为大蘖群>中蘖群>小蘖群;P素营养返青初为小蘖群>中蘖群>大蘖群,拔节后呈大蘖群>中蘖群>小蘖群,返青—拔节为优势转化阶段;N素营养的优势转化期同P素相比明显滞后 相似文献
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甜糯玉米采收与保鲜技术研究 总被引:40,自引:2,他引:40
研究表明 ,鲜食玉米鲜穗适宜采收期为授粉后 2 3~ 2 5d。收获后贮存期间鲜玉米含糖量受温度影响极大 ,达极显著相关 (r =0 980 4 ) ,贮存温度低 ,呼吸强度小 ,糖分降解慢 ,保鲜效果好。加工品质和风味由冷热处理的温度和时间决定。热处理时间为 18~ 2 4min ,冷处理温度为 - 45℃~ - 38℃时 ,保鲜效果最好 相似文献
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Abstract: This paper shows that an important requirement of the MIRAB model, economic success in the host country, is a characteristic of Pacific Islander migrants to the USA and their offspring. Pacific Islanders improved their economic lot in the 1980s and again in the 1990s. Part of this improvement was due to increases in their human capital: Pacific Islanders acquired more education, work experience and better English language skills. This upgrading allowed more workers to acquire white‐collar jobs and to increase their earnings. 相似文献
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大棚栽培多数是长年连作,密闭条件好,土壤中农药的残留问题就更加明显。实验证明藻类植物地木耳可在大棚中生存。通过在大棚种植的蔬菜旁种植地木耳,可使大棚土壤和蔬菜中农药含量降低.降低幅度约为59%。 相似文献
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大棚栽培多数是长年连作,密闭条件好,土壤中农药的残留问题就更加明显。实验证明藻类植物地木耳可在大棚中生存。通过在大棚种植的蔬菜旁种植地木耳,可使大棚土壤和蔬菜中农药含量降低,降低幅度约为59%。 相似文献
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Recent studies have found evidence of a local employment multiplier’s effect. For the most part, these studies provide an average estimate for all labor markets. In this paper, we examine how the average local employment multiplier, the effect of an exogenous increase in employment in the tradable sector on total employment, depends on the characteristics of the local labor market. Specifically, we estimate the average multipliers for coastal, noncoastal, large, and small metropolitan statistical areas (MSAs) across different time periods using the data of 333 US MSAs. Overall, we find a reduced form of local employment multiplier ranging from 1.38 to 2.24, which is within the range of typically estimated local employment multipliers. In addition, the characteristics of the local labor market matter. The local multipliers appear larger in noncoastal and large MSAs. For small and coastal metros, the multiplier is closer to 1.5 than to 2.0 while in the case of large and noncoastal metros, it is closer to 2.0 than to 1.5. The local multipliers are also sensitive to the time period considered. 相似文献
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近20年我国棉花生产主栽品种概况及其评价 总被引:6,自引:4,他引:6
本文以大量的数据 ,对近 2 0年来我国棉花品种的数量及其推广面积进行了综合评述 ,从中总结出各产棉省棉花生产发展历程及趋势。 1 999年始 ,棉花放开经营 ,2 0 0 1年始 ,棉花生产及其后续产品完全进入市场 ,棉花作为我国“战略物资”的时代已一去无返。面对即将进入 WTO及其后的挑战与机遇 ,棉花生产及育种重点必将以市场的需求为调整目标 ,文中谨以此为依据宏观提出今后的发展建议 ,以飨读者 相似文献
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A collection of 51 accessions of Phaseolus vulgaris L. from N.W. of the Iberian Peninsula was evaluated for phenological, morphological, and agronomic characters for two years to study patterns of variation. Data were subjected to cluster analysis by variables choice, and six groups could be identified. These in turn corresponded to each previously described races ‘Nueva Granada’ and ‘Chile’ of South American origin, and races ‘Durango’ and ‘Mesoamerica’ of Middle American domestication center. Accessions falling in race ‘Nueva Granada’ had two distinct gene pools. 相似文献
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LI Ting-ting 《保鲜与加工》2007,(3):22-26
Disaster prevention is the main reason of building origin and its direct developing motivation.The hakka's ancestor migrated from the Yellow River drainage basin for escaping the wars and built the dwellings with the style of homeland building,which comes to the first formation of the traditional architecture.Through the understanding the nature disasters and the results of disaster prevention,the hakka changed the plan and body of the building.The traditional dwellings in their matured stage improve their life-span by application of the disasters prevention measures. 相似文献