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在东北地区,通过田间试验,最终筛选出薯片加工型品种春薯5号适宜在二季作地区生产;美国切片和丰白适宜在二季作区、一、二季混作区和一季作区生产;斯诺丹适宜在一、二季混作区、一季作区生产;大西洋适宜在二季作区、一、二季混作区生产。 相似文献
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研究橡副珠蜡蚧(Parasaissetia nigra Nietner)在香蕉、美人蕉、橡胶树、小叶枇杷、芒果、柑橘、蓖麻、木薯、柠檬、扶桑、木瓜、荔枝、番石榴、垂叶榕等寄主植物上的发育、存活和繁殖情况.结果表明,橡副珠蜡蚧的世代发育时间以在香蕉上的最短(为62.81 d),在垂叶榕上的最长(为120.58 d);世代存活率以在橡胶树上的最高(为67.30%),在垂叶榕上的最低(为6.51%);平均产卵量以在橡胶树上的最多(为801.34粒),在垂叶榕上的最少(为121.86粒);内禀增长率以在橡胶树上的最大(为0.068 1),在垂叶榕上的最小(为0.0146).综合比较橡副珠蜡蚧在14种不同寄主植物上的发育历期、存活率、产卵量及种群特征参数,发现橡胶树、香蕉和美人蕉是橡副珠蜡蚧种群生长发育和繁殖特性最适宜的寄主植物,垂叶榕、番石榴、荔枝和番木瓜是橡副珠蜡蚧的最不适宜寄主植物. 相似文献
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大豆灰斑病的研究进展 总被引：8，自引：0，他引：8
1 大豆灰斑病的分布和危害大豆灰斑病 (CercosporasojinaHara)为真菌病害 ,在 1 91 5年由Hara首先在日本发现 ,此后相继在美国、英国、前苏联、中国、加拿大、澳大利亚、巴西、委内瑞拉、危地马拉等国均有发生 ,至今大豆灰斑病已成为一种世界性病害。在我国大豆灰斑病的发生也很普遍 ,自 1 92 1年发现以来 ,遍及各大豆种植区 ,主要分布在黑龙江、吉林、辽宁、河北、山东、安徽、江苏、四川、广西、云南等省。尤以黑龙江省最为严重 ,从 2 0世纪 60年代至今 ,大豆灰斑病在黑龙江省已有四次大发生 ,给生产和外贸造成严重的损失 ,已成为黑龙… 相似文献
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大豆不同碳代谢产物含量变化研究 总被引：3，自引：0，他引：3
为明确不同碳代谢产物在大豆不同器官变化规律,在大田条件下,以三个栽培大豆品种为材料,测定不同生育时期不同器官可溶性糖、蔗糖、淀粉的含量.结果表明:随着生育进程推进,可溶性糖在茎秆、叶片、叶柄中及蔗糖在叶片、叶柄中含量呈"V"型变化,淀粉在茎杆中含量呈倒"V"型变化,R3期为转折点;可溶型糖在荚皮中含量及蔗糖在茎秆、荚皮中含量、淀粉在叶柄、荚皮含量呈逐渐升高趋势,叶片淀粉含量表现为升高-降低-升高趋势;不同品种大豆碳水化合物在植株体内变化规律相似.三种碳代谢产物含量在叶片中均表现为极显著正相关,而在茎秆中不同碳代谢产物含量相关性因品种而异. 相似文献
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《Journal of Crop Improvement》2013,27(2):415-432
Summary This paper reviews the effects of allelopathic interactions in agroecosystems in Spain on plant physiological activity and their ecological advantages. The phenological stage of growth of donor plants and the effective allelochemicals in the soil solution while studying the role of phenolic compounds were highlighting. Finally possible future prospects and conclusions regarding weed control by allelochemi-cals under integrated crop management strategies are discussed. 相似文献
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《Plant Production Science》2013,16(2):189-198
AbstractGrain number per spike of wheat is lower in early sowing than in the conventional standard cultivation in Yamaguchi, Prefecture, Japan. Components of the grain number per spike in five cultivars were analyzed with respect to temperature during the spike development period throughout three growing seasons 2001/2002, 2002/2003 and 2003/2004 to find the cause of the problem of early sowing cultivation. The plants sown in early-October and late-November were called the early sown group and the standard group, respectively, in the following. Three of the five cultivars, Hokushin, Akitakko and Nanbukomugi, showed a strong winter habit, which requires very cold temperatures for spike differentiation. The other two cultivars, Iwainodaichi and Airakomugi, had a moderate winter habit. Grain number per spike and grain yield were decreased by early-sowing (compare with the standard group) in almost all cultivars throughout the three growing seasons. The three cultivars which had a strong winter habit had fewer spikelets per spike in the early-sown group than in the standard group. The other two cultivars which had a moderate winter habit had fewer grains per spikelet in the early-sown group. The higher the temperature during the spikelet formation phase, which is from flag leaf initiation to terminal spikelet initiation, the higher the number of spikelets per spike in the standard group. The spikelet number per spike in the early-sown group increased with the increase in productive tillers under fertile conditions. Such conditions also increased the grain number per spike. 相似文献
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Summary Diurnal changes in net photosynthetic rate were measured in a furrow-irrigated potato crop and in a riverbed crop where the
water table was always maintained at 20–28 cm from the soil surface. In the irrigated crop, the photosynthetic rate during
mid-afternoon was about half the peak rate observed at noon. This reduction was accompanied by a near tripling of stomatal
resistance, a 45% reduction in transpiration, and a 5-fold increase in the difference between leaf and air temperatures. No
such changes were observed in the riverbed crop where the photosynthetic rate remained nearly constant at about 0.9 mg m−2 s−1 between 9 a.m. and 4 p.m. Tuber yield in the riverbed crop was about 30% higher than in the irrigated crop. 相似文献
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体细胞无性系变异是一种重要的细胞工程育种技术,其应用于棉花育种的前提是建立高效的组织培养诱导再生植株体系.本文简要综述了棉花离体诱导植株再生研究的现状,重点讨论了棉花体细胞无性系变异的表现、利用方法及机理,提出了当前研究存在的问题并对今后的研究进行了展望. 相似文献
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Corné Kempenaar Thomas Been Johan Booij Frits van Evert Jean-Marie Michielsen Corné Kocks 《Potato Research》2017,60(3-4):295-305
Precision agriculture is a farming management concept based on observing, measuring and responding to inter- and intra-field variability in crops. In this paper, we focus on responding to intra-field variability in potato crops and analyse variable rate applications (VRAs). We made an overview of potential VRAs in potato crop management in The Netherlands. We identified 13 potential VRAs in potato, ranging from soil tillage to planting to crop care to selective harvest. We ranked them on availability of ‘proof of concept’ and on-farm test results. For five VRAs, we found test results allowing to make a cost-benefit assessment. These five VRAs were as follows: planting, soil herbicide weed control, N side dress, late blight control and haulm killing. They use one of two types of spatial data: soil maps or biomass index maps. Data on costs and savings of the VRAs showed that the investments in VRAs will pay off under practical conditions in The Netherlands. Savings on pesticide use and N-fertilizer use with the VRAs were on average about 25%, which benefits the environment too. We foresee a slow but gradual adoption of VRAs in potato production. More VRAs will become available given ongoing R&D. The perspectives of VRAs in potatoes are discussed. 相似文献
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以翔实的资料对2009年中国稻米生产、消费、进出口、供求平衡、库存、价格走势、购销政策和国际稻米供求等情况进行了全面地分析,对影响2010年稻米市场价格走势的各种因素进行了深入研究,并在此基础上对2010年我国稻米市场价格走势进行了预测,结论是我国稻米价格仍呈上行趋势。 相似文献