共查询到15条相似文献，搜索用时 56 毫秒
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滚筒杀青机是一种以炒杀为主，兼有蒸杀作用的高效连续杀青机。我国最早研制的70、80型滚筒连续杀青机主要用于大中型茶厂（场）中低档茶的杀青。上世纪90年代初，随着人们生活水平的提高，我国名优茶发展迅速，由于手工加工名茶工效低、品质不稳定，机制名优茶技术得以迅速发展。小型滚筒连续杀青机已成为我国名优绿茶杀青的主要机型，具有杀青叶芽叶完整、叶色绿、汤色清澈明亮的特点。目前开发的用于名优绿茶杀青的滚筒连续杀青机有30、40、50型，其中30型滚筒连续杀青机适用于小规模生产，大量生产则采用40、50型滚筒连续杀青机。 相似文献
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杀青是名优绿茶加工的关键工序之一.锅炒杀青一直是名优绿茶杀青的主要方式,具有茶叶香气高、滋味鲜醇的特点,但生产上容易出现茶叶烟焦的现象,影响了名茶的品质.近年来,蒸青茶因其色泽绿,汤色稳定的特点受到许多厂家和消费者的青睐.
日本对蒸青茶的研究偏重于煎茶品类,煎茶原料多以一芽三四叶为主,一般杀青时间掌握在40～50s.国内齐桂年、刘勤晋选用一芽二叶、一芽三叶初展为原料对其研制的加压式滚筒连续蒸汽杀青机轴转速、筒转速和筒倾角的优化组合工艺参数进行了研究.梁咏诚对云南大叶种绿茶蒸汽杀青工艺进行了研究,所用蒸汽杀青机由当地民间蒸米粉机改进而成.欧丽兰对四川和重庆两地蒸青生产线的工艺参数进行了对比研究,确定最佳的工艺组合.进一步的研究未见报道. 相似文献
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正"武阳春雨"是浙江省武义县名优绿茶的代表,其品质的形成主要受原料、加工工艺等影响。其中,杀青是加工的关键步骤,对成品茶品质起着决定性的作用。鲜叶通过杀青,酶的活性钝化,内含的各种化学成分在没有酶影响的条件下,由热力作用推动进行热物理化学变化,从而形成了绿茶"清汤绿叶"的品质特征。目前,茶叶加工常用的杀青方式有汽热杀青、微波杀青、热风杀青、滚筒杀青等。杀青方式不同,杀青效果各异。本试验通过采用不同的杀青方式加工"武阳春雨"茶,研究杀青对茶叶理化成分和感官品质的影响,以期为"武阳春雨"名优绿茶生产提供参考依据。 相似文献
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1997～1998年采用砂培和田间小区试验研究了玉米品种和氮肥对耐铵型玉米联合固氮工程菌Enterobacter gergoviae-7(E7)接种效应的影响.试验结果表明,玉米品种对E7接种的反应不同,大多数玉米品种表现出正效应,少数玉米品种表现出负效应;9个玉米品种的试验结果,接种E7对地上干重的影响为-12.7%至30.0%,平均为9.0%,对地下干重的影响为-15.3%至50.9%,平均为16.4%;接种E7比接种E57-7使玉米地上干重提高7.7%,地下干重提高9.3%;接种E7能刺激玉米分根,使根条数增加;接种E7对玉米产量的影响表现出品种间的接种效应差异,施氮量不同对E7的接种效应同样表现出影响. 相似文献
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茶叶杀青中供需热量 ,会受到鲜叶水份含量和所处环境温度的影响。实践得知 ,水份含量高时 ,杀青时间会相应延长。在环境温度低的春季 ,杀青锅底部必须烧至微红 ;气温高的暑伏季节 ,锅温只需烧至呈灰白色即能满足工艺处理要求 (指加工普通绿茶的大锅 )。因此试验得出在常温 2 0℃下的最佳供需热系数 ,必须结合环境温度和鲜叶含水率的进行修正。但是水份含量与环境温度 ,到底会产生多大的影响 ?其调整幅度如何掌握 ,我们可以按照有关公式求得。1 .鲜叶水份含量的影响 :从茶叶比热计算的经验公式 C=0 .38+ 0 .62W可知 ,鲜叶含水率的多少 ,决定… 相似文献
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以"和谐"号大豆为材料,研究了腐植酸钠与根瘤菌剂和不同肥料处理对大豆共生固氮和光合作用的影响。结果表明,利用腐植酸钠、钼酸铵、根瘤菌剂(КБ11+ММ117)进行拌种和生育期间叶面喷施腐植酸钠处理,增加了叶面积和光合势,提高了根瘤数量、根瘤干物质积累量和固氮效率,最终获得的籽粒产量高达2 360 kg.hm-2,较对照提高了22%。 相似文献
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C. A. MARRIOTT 《Grass and Forage Science》1988,43(3):253-262
The seasonal variation in herbage mass and nitrogen fixing (acetylene reducing) activity of white clover in an upland sward, cut weekly to 3·5 cm from mid-May until mid-October, was measured. Acetylene reducing activity (ARA) was measured over a 24-h period at 3-weekiy intervals starting on 3 March 1983. Clover leaf and Stalon biomass was measured by harvest of the assay truces, and from mid-May quadrat euts to 3·5 cm above the soil surface provided estimates of herbage accumulation.
Little A RA was detected in March, but activity increased substantially after 10 cm soil temperatures reached > 3°C, and peak activity per unit of clover leaf dry weight occurred in June and July; standing clover leaf dry matter increased during the season to a maximum of 60·5 g m−1 in June. Acetylene reducing activity was positively correlated with the number of rooted nodes, and Stalon and leaf dry weights in early spring. Thereafter, except during a period of summer drought, ARA was positively correlated with the amount of clover leaf material.
Clover population density increased during the season and maximum growing point numbers (5540 m−1 ) occurred in September; maximum leaf number per unit area (12 984 m−1 ) was found in October, prior to the final cutting of the site.
Results suggest that higher levels of nitrogen fixation in upland swards should be obtained if sward management regimes, which encourage a high clover leaf area, are adopted. 相似文献
Little A RA was detected in March, but activity increased substantially after 10 cm soil temperatures reached > 3°C, and peak activity per unit of clover leaf dry weight occurred in June and July; standing clover leaf dry matter increased during the season to a maximum of 60·5 g m
Clover population density increased during the season and maximum growing point numbers (5540 m
Results suggest that higher levels of nitrogen fixation in upland swards should be obtained if sward management regimes, which encourage a high clover leaf area, are adopted. 相似文献