共查询到20条相似文献，搜索用时 546 毫秒
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1 池州茶叶生产概况
池州茶区位处北纬29°38′～30°51′,东经116°38′～118°10′属亚热带季风气候区。现有63个乡镇产茶,分布在九华山脉和仙寓山脉周围的44个乡镇是名优茶产区,生态环境优越,森林覆盖率大于79％,水资源丰沛,植被完好,海拔大部分在300m以上,矿质元素丰足,有机质含量较高,无环境污染,系茶树生长的最适宜地区。 相似文献
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大豆竞争替代紫茎泽兰的种植模式研究 总被引：2，自引：0，他引：2
为明确大豆与紫茎泽兰的种间竞争关系,探索紫茎泽兰替代控制的途径和策略,采用田间试验方法,研究土壤翻耕方式、紫茎泽兰的割除方式和大豆的种植密度等栽培方法对大豆和紫茎泽兰的竞争效应的影响,定量分析两者的株高和密度、对光照和水肥的竞争能力以及大豆的产量。结果表明:不翻耕、在紫茎泽兰空隙间点播大豆的处理区,紫茎泽兰为优势种群,大豆的生长和产量受到明显抑制。不翻耕、刈割紫茎泽兰后点播大豆的处理区,大豆为优势种群,对光照的竞争能力强,紫茎泽兰的发生密度和株高被显著抑制,对水肥的吸收显著降低,且随着大豆种植密度的增加,大豆产量显著增加,从2 113.66kg/hm2增加至2 885.62kg/hm2。旋耕处理区,紫茎泽兰的防除效果达到了100%,大豆的产量达到3 828.02~4 007.87kg/hm2。通过合理的栽培措施,大豆的竞争优势很强,可以有效替代紫茎泽兰,且产生较高的经济效益。 相似文献
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油菜对紫茎泽兰的替代控制效果 总被引：2，自引：0，他引：2
为研究油菜Brassica napus L.替代紫茎泽兰Eupatorium adenophora Spreng的可能性,探索紫茎泽兰替代控制的途径和策略,在四川西昌进行了田间试验,设置紫茎泽兰割茎和翻耕后种植油菜两种模式,分析两种植物株高、密度、叶面积的差异和对田间光照、水肥的竞争消耗能力。研究结果表明,翻耕种植油菜后,对紫茎泽兰防控效果达100%,能显著减少紫茎泽兰对田间水肥的消耗,油菜产量随着种植密度4株/m~2、8株/m~2、12株/m~2的增加呈显著增加趋势,产量从2 830.75kg/hm~2增加至5 332.28kg/hm~2,每公顷产值达14 153.75~26 661.38元。结果表明翻耕后采用合理密度种植油菜,不仅能很好地控制紫茎泽兰,而且可获得较高的经济效益。因此,在适宜油菜种植的紫茎泽兰发生区,采用翻耕后种植油菜替代控制紫茎泽兰,既能取得较好的生态控草效果同时能够显著增加农民收入。 相似文献
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福建省永泰县位于福建省中部,福州西南,东经118°～119°,,北纬25°～26°,属亚热带气候区,光温资源非常适合水稻生长.2008年福建省农科院水稻研究所在永泰富泉乡力星村建立15 hm2特优航2号生产示范片,表现高产、稳产、适应性广、抗性强等特点,深受当地群众好评,现将其种植表现及栽培技术总结如下. 相似文献
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北疆棉花品种选育及技术对策 总被引：3，自引：2，他引：1
北疆棉田主要分布于海拔250～500m（霍城为500700m）之间的准噶尔盆地西南部的玛纳斯河流域、奎屯河流域、博尔塔拉河和伊犁河流域以及新疆生产建设兵团四、五、六、七、八师的52个植棉团场。本棉区地理位置是北纬43°22’～45°45’,东经82°04’～87°55’。棉花常年种植面积46．6万多公顷,约占全疆棉田的40％,是中国主要的早熟棉区。 相似文献
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<正>烟台市地处山东半岛东部,位于东经119°34'～121°57',北纬36°16'～38°23',按照茶区划分,为次适宜种植区,能否安全越冬成为该地区茶树产业发展的关键,作者经过4年的对比试验,总结出一套适用于北方茶区的茶园越冬技术。 相似文献
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长白山一带延边野亚麻 总被引：1，自引：0，他引：1
延边地区位于吉林省东部,地处北纬41°59′～44°31′,东径127°29′～131°18′,属于长自山一带的山区或半山区,无霜期110～145天,年降水量350～500毫米,有效积温2150～2800℃,海拔70～400米,部分400米以上。延边地区栽培纤维用亚麻有50多年的历史,是国内主要亚麻产区之一。该区气候、纬度和土质等均适宜亚麻栽培,为进 相似文献
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南疆棉区在东经75°40′～88°56′,北纬36°50'～42°18′之间,位于天山以南、昆仑山以北、帕米尔高原以东的广阔地区,棉田主要分布在塔里木盆地边缘,植棉面积和总产均占全新疆的60%以上. 相似文献
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Effects of simulated grazing on growth and persistence of Artemisia frigida in a semiarid sandy rangeland 总被引：4，自引：0，他引：4
Abstract To assess the tolerance of fringed sagewort (Artemisia frigida Willd.) to grazing in semiarid sandy rangeland, forty‐five fringed sagewort plants of similar size were chosen randomly from sandy rangeland and divided into three cohorts (fifteen plants per cohort) that were subjected to simulated grazing management in 1998. Plants were cut in spring on 24 April and again in summer on 26 July at either 2–3 cm (severe), or at5–6 cm (moderate), or uncut to serve as the control. Plant responses to intensity of cutting were monitored over two consecutive years differing substantially in the amount and seasonal distribution of rainfall. Cutting in spring (moderate or severe) did not influence plant height, average canopy diameter, the number of branches, and specific branching density measured in July 1998. Moderate cutting in summer reduced plant height compared with the uncut treatment but did not influence other plant growth variables in September 1998. However, severe cutting in summer during the reproductive stage strongly reduced plant height, canopy size, the number of branches, individual shoot weight and specific branching density in September 1998 compared with moderate and no cutting and its negative impacts on the growth of this species were evident in the following year. Severe cutting in spring significantly increased the number of flowering shoots, whereas cutting in summer (at either level) reduced the capacity of fringed sagewort to produce flowering shoots. Also, the negative impact of summer cutting on seed production continued in the following year. The production of plant biomass was similar in the three treatments in 1998, but it was significantly lower in cut than uncut plants in 1999. The reduced biomass was due to a decline in plant height, canopy size, number of branches and specific branching density. Compared with the uncut plants, the cut plants tended to allocate a greater proportion of their biomass to vegetative shoots and leaves than to flowering shoots in 1998; in 1999, although cutting treatments had ceased, the cut plants still allocated a greater proportion of new biomass to vegetative shoots and less to flowering shoots, but a similar proportion to leaves. 相似文献
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Mukhtar AA 《Pakistan journal of biological sciences: PJBS》2011,14(22):1028-1031
Inadequate and erratic rainfall pattern and extreme temperature variations induced by climate change being experienced in Sudan savanna areas have compromised the cropping systems of these areas. A change in the cropping patterns is required to maintain and improve upon crop output levels. The pod yield ha(-1) and other growth and yield components of three varieties of groundnut grown under irrigated conditions were measured in a field experiment conducted at the Irrigation Research Station of the Institute for Agricultural Research, Zaria, from 2003 to 2006 dry seasons. Treatments consisted of three plant populations (50,000, 100,000 and 200,000 plants ha(-1)), three varieties (Samnut 23, Samnut 21 and Samnut 11) and three basin sizes (3 x 3, 3 x 4 and 3 x 5 m) arranged in a split plot design with population and variety as main plot and basin size as sub plot. Treatments were randomly assigned and replicated three times. Plant populations significantly affected plant height and canopy spread but had no effect on number of branches plant. Plants grew significantly taller at 200,000 plants ha(-1) while plant canopy spread was significantly widest at 50,000 plants ha(-1). Samnut 23 grew significantly taller than Samnut 21 and 11 although they exhibited wider canopies. Pod yield ha(-1) and 100 seed weight were significantly highest at 200,000 plants ha(-1). Samnut 23 produced the significantly highest pod yield ha(-1) and number of pods plant(-1). Samnut 11 produced significantly highest 100 seed weight. Samnut 23 planted at 200,000 plants ha(-1) in 3 x 4 m basins is most promising for irrigated groundnut cultivation in the Sudan savanna of Nigeria. 相似文献
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为了提高蓖麻杂交育种效率，研究杂交组合收获指数与性状之间的关系，观察和测量了133个蓖麻杂交组合的13个农艺性状，即收获指数、单株产量、生物量、百粒重、有效穗数、一级分枝数、株高、茎粗、主茎节数、主穗长、主穗位高、叶绿素含量、净光合速率。采用相关分析和回归分析研究133个杂交组合的农艺性状间的关系。结果表明，不同蓖麻杂交组合的收获指数差异较大，变幅为0.126~0.644，平均值为0.398；133个杂交组合中收获指数在0.5以上的组合仅占16.54%。相关关系结果表明，收获指数与单株产量呈极显著正相关，与主穗长呈极显著负相关。回归分析表明，单株产量、株高、主穗长、有效穗数4个性状对收获指数的影响较大。因此在育种过程中，选择主穗花序较长、植株相对较高、一级分枝数较多的个体，可提高育成材料的单株产量。 相似文献
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紫茎泽兰对花生生长的影响及其经济阈值 总被引：5，自引：0，他引：5
为有效反映大田条件下紫茎泽兰对花生生长和产量的直接危害和经济危害允许水平,采用添加系列试验和模型拟合的方法研究不同紫茎泽兰密度下花生的生长和产量变化以及花生田间透光率和紫茎泽兰水肥积累量的变化。结果表明,花生在紫茎泽兰的竞争干扰下,花生荚果数、百仁重和果仁产量均随紫茎泽兰密度的增加而逐渐降低。花生荚果数和百仁重的降低可能是花生减产的直接原因。此外紫茎泽兰对田间透光率的影响和对水肥的累积量也可能是花生减产的重要原因。幂函数模型能较好地拟合紫茎泽兰密度（x）与花生产量损失率（y）间的关系（y=1.712x1.063,P<0.0001）。花生田采用人工除草、草甘膦和氨氯吡啶酸对紫茎泽兰进行防除时,紫茎泽兰的经济危害允许水平分别为6.06%、0.57%、0.77%,经济阈值分别为3.28、0.36、0.46株•m-2。 相似文献
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《Field Crops Research》2002,78(1):1-8
Field studies were conducted to determine the potential for intraspecific responses in crop growth and grain yield of 20 soybean cultivars to enhanced ultraviolet-B (UV-B, 280–315 nm) radiation. The supplemental UV-B radiation was 5.00 kJ m−2, simulating a depletion of 20% stratospheric ozone at Kunming (25°N, 1950 m). Out of the 20 soybean cultivars tested, 17 and 15 showed significant change in plant height at 80 DAP (days after planting) and ripening stages, respectively. Sensitivity in plant height was greater at 80 DAP than at ripening. The plant height of 3 cultivars increased, and that of 17 cultivars decreased. Under UV-B radiation, LAI (leaf area index), biomass and grain yield decreased, respectively. The greatest percent decrease was 95.7, 93.9 and 92.8, respectively. RI (response index) was the sum of percent change in plant height at ripening, LAI, biomass and grain yield. The results showed that all 20 soybean cultivars had a negative RI, indicating inhibition by UV-B radiation on soybean growth. The RI of 6 tolerant cultivars was higher than −163.1 and 5 out of 6 originated from south China (low latitude). The RI of the most tolerant cultivars, Yunnan 97801, was −72.4. Meanwhile, the RI of 5 sensitive cultivars was lower than −256.9 and 4 out of the 5 originated from north China (high latitude). The RI of the most sensitive cultivar, Huanxianhuangdou, was −295.7. These UV-B tolerant cultivars identified in this study might be useful in breeding programs. 相似文献
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本试验研究了原产地不同的大豆品种在冀东夏播条件下，农艺性状，生育期结构，生育期比（Ｒ／Ｖ），生物学产量，器官平衡，经济系数等影响产量的重要因素的表现。结果表明：夏大豆籽粒产量与株高，主茎节数，分枝数，单株荚数，单株粒数，碍粒重均呈正相关。冀东地区夏大豆要获得１５０－２００公斤／亩籽粒产量，主要农艺性状应达到：株高６５厘米，主茎１６节，分枝１－１．２８个，在２．０－２．２２万株／亩密度条件下，单株荚 相似文献
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Apart Flora, life form and chorotype of plants in protected region Sarigol was investigated in this study. It's located at the 57 degrees 47' to 57 degrees 76' Eastern latitude and 37 degrees 55' to 37 degrees 80' Northern longitude. A part plant of this area was collected in this region by classical method of regional floristic studies. The results of field investigation were identification of 78 plant species belong to 66 genera and 25 families. Lamiaceae, Poaceae, Fabaceae, Brassicaceae and Asteraceae were the most dominant families analysis of life form has shown proportion hemicryptophytes 39.74, followed by therophytes 21.79%, chamaephytes 19.23%, cryptophytes 11.53% and phanerophytes 7.69%. phytogeographical data has indicated that the most plants belong to the Irano-Turanian floral elements 75.64%. 相似文献
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调查了福建省大田县梅山乡3年生和1年生邓恩桉遭受2011年初春持续低温后的生长表现（以冻害指数为指标）。结果表明：不同海拔高度邓恩桉的冻害指数差异极显著,随着海拔高度的升高,邓恩桉冻害指数增大;低温对海拔400 m以下的邓恩桉生长影响不明显,对海拔400-750 m的邓恩桉冻害指数影响极大,导致海拔750 m以上的邓恩桉死亡;同一海拔水平上1年生邓恩桉受冻害的危害明显大于3年生,1年生邓恩桉下坡、中坡和上坡的平均冻害指数差异不显著,3年生邓恩桉下坡、中坡和上坡的平均冻害指数依次显著增大;冻害指数与树高、地经均呈显著负相关,说明随着邓恩桉林龄的增加,树高、胸径生长,抗冻害能力明显增强。 相似文献
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荫蔽对大豆主要性状的影响及大豆耐荫性鉴定方法研究初报 总被引：10，自引：2，他引：10
模拟间套种的荫蔽条件，设置不同的遮光处理，研究荫蔽对大豆13个主要性状的影响。结果表明，结荚期株高、收获期株高、最低结荚高度、结荚期生物产量、单株荚数、单株粒数、单株产量和百粒重等8个性状发生显著变异，变异与荫蔽程度极显著相关，其中，前3者为正相关，其余5性状为负相关；结荚节位和主茎直径变异极显著，分枝数变异显著，但与荫蔽程度相关性不显著；主茎节数和单株瘪荚数变异不显著。选择受荫蔽影响显著且与荫蔽相关性显著的株高、最低结荚高度、结荚期生物产量、单株荚数、单株粒数、单株粒重和百粒重等7个性状为指标性状，以综合耐荫系数为指标，采用综合方法评定大豆种质的耐荫性，将耐荫性鉴定级别划分为五级。 相似文献