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1.
二倍体鸭茅农艺性状的初步研究 总被引：16，自引：2，他引：14
采用横断山区野生的五份二倍体鸭茅与采自横断山和庐山的野生四倍体鸭茅进行农艺性状的对比研究。结果表明，二倍体鸭茅生育期比四倍体长２６天，拔节期延迟４５天，以后的生长速度高于四倍体。但种子质量，分蘖力，再生性，茎叶比，抗热力等均不如四倍体鸭茅；分蘖期刈割，年均干草产量３６５０ｋｇ／ｈａ，相当于四倍体的３０％，粗蛋白质年均产量５７３ｋｇ／ｈａ，相当于四倍体的２６．５％，二倍体孕期干物质年产为３９３０ｋｇ 相似文献
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将１８头具有代表性的荷斯坦奶牛随机分为试验组和对照组，每组９头。在其它条件基本相同的情况下，试验组按精料的１％添加“促奶灵”饲料添加剂，结果试验组比对照组每头牛日增加产有量２．０７ｋｇ，产量提高１０．８７％，牛奶中总氨基酸和必需氨基酸分别提高了３９．２７８ｍｇ／ｋｇ和１０．８４０ｍｇ／ｋｇ；投入产出比为１：９．２。 相似文献
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四川凉山州光叶紫花苕良种选育及推广研究 总被引：4，自引：0，他引：4
通过对凉山光叶紫花苕良种选育及应用研究，系统分析了该草种在不同生态条件下（海拔１５００～３２００ｍ）的生物学和生态学特性。主要经济性状是：分枝期全草干物质中粗蛋白含量为３０．６９％，粗脂肪８．７０％，粗纤维２２．８０％，无氮浸出物为２８．０３％，粗灰分８．７２％，钙１．４８％，磷０．２３％，还含有１７种必需氨基酸。平均鲜草产量４５０００～７５０００ｋｇ／ｈｍ２，种子产量６００～１２００ｋｇ／ｈｍ２。１９９６～１９９８年全州种植面积达８．５万ｈｍ２，鲜草总产２６．２６８亿ｋｇ，产值２．６２６８亿元，推动了全州畜牧业生产的发展。 相似文献
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对采自贵州省册亨县、三都县的窄叶野豌豆野生种进行了引种驯化。结果表明：其产草量中等，鲜草３７．５～４５ｔ／ｈｍ２，草质优良；生育期短，早熟；种子产量高，收纯净种子５００～６００ｋｇ／ｈｍ２。适合在我国南方中亚热带地区同水稻、玉米轮作，也可作为农田填闲作物栽培 相似文献
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磷对紫花苜蓿和奶山羊生态系统生产力的影响 总被引：1，自引：0，他引：1
在陕西省陇县跃先村生态农业试验区进行了土壤－紫花苜蓿－奶山羊生产系统磷调控的试验。分别测定１－８年生紫花苜蓿人工草地不同条件下土壤，草，根的磷含量，以及根，草产量；测定了用同施磷量处理的紫花苜蓿饲喂奶山羊后的产奶量以及奶，粪和尿中的磷含量，分析表明，系统磷素最大允许输入量为８７．５ｋｇ／亩，最佳输入量为６２．５ｋｇ／亩。使系统保持稳定的磷肥输量为６２．５－７５ｋｇ／亩。在最佳施肥条件下，苜蓿生产效 相似文献
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四川凉山州光叶紫花苕良种德育及推广研究 总被引：2，自引：0，他引：2
通过对凉山光叶紫花苕良种选育及应用研究，系统分析了该草种在不同生态条件下（海拔１５００－３２００ｍ）的生物学和生态学特性，主要经济性状是，分枝期全草干物质 蛋白含量为３０．６９％，粗脂肪８．７０％，粗纤维２２．８０％，无氮浸出物为２８．０３％，粗灰分８．７２％，钙１．４８％，磷０．２３％，还含有１７种必需氨基酸。平均鲜草产量４５０００－７５０００ｋｇ／ｈｍ＾２种子产量６００－１２００ｋｇ／ｈｍ＾２ 相似文献
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Mirabel（迈瑞佰）百脉根引种及生产性能的动态研究 总被引：1，自引：0，他引：1
文章对Ｍｉｒａｂｅｌ百脉根品种的饲草和种子生产有关的特性进行了系统的观测，结果表明，该品种具抗寒抗旱，耐盐碱性强，分枝多，叶片丰富，生活第２、第３年饲草产量可达４５００ｋｇ／ｈｍ２，种子产量近９００ｋｇ／ｈｍ２，叶量占茎叶总量的４６％；饲草营养价值高，开花期粗蛋白质含量占干物质量的２０．７９％；粗纤维占２６．４３％；蛋白质的含量高于紫苜蓿、红豆草；而粗纤维又比它们低等优点，在我国西北内陆寒冷干旱具有灌溉条件的甘肃河西走廊地区具有较高的引种栽培价值。 相似文献
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１产需现状 据统计，云南省１９９８年的水果面积为１９．５２万ｈｍ~２，总产量 ６８．８万 ｔ，人均 １６．４１ｋｇ，比 １９８８年的６．３万余 ｈｍ~２、 ３２．５万 ｔ、人均 ９．０４ｋｇ，分别增加２０８．２１％、１０９．４４％和８１．２５％。尽管发展速度快，产量增加大，但人均占有量只有同期全国人均占有量４３．９８ｋｇ的３７．３１％和人体营养需要量７０～８０ｋｇ的２０．５１％～２３．４４％，跟不上人民生活水平提高和市场需求增长的速度。每年外省进入云南的水果达１２万ｔ以上，每年１０月至次年４月，市场上全是… 相似文献
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克伦特罗在猪体内的生物利用度及药物动力学研究 总被引：20，自引：1，他引：19
６头体重４７．００±４．５７ｋｇ（Ｘ±Ｓ）的健康长白和大白杂交猪，拉丁方设计试验，按４ｍｇ／ｋｇ静注、肌注和内服克伦特罗，高效液相色谱法检测血浆中药物浓度，ＭＣＰＫＰ药代动力学程序处理药时数据。静注给药的药代动力学参数是：ｔ１／２α０．６２±０．１２ｈ，ｔ１／２β４．８７±１．５６ｈ，Ｖｄ（ａｒｅａ）４．４８±０．５６ｌ／ｋｇ，ＣｌＢ０．６３±０．１１ｌ／ｋｇ／ｈ，ＡＵＣ６．３９±１．２７μｇ／ｍｌ．ｈ。肌注给药的药动学参数是：ｔ１／２Ｋａ０．２２±０．１０ｈ，ｔ１／２α０．５６±０．２１ｈ，ｔ１／２β４．２５±１．１０ｈ，ｔｍａｘ０．６０±０．１３ｈ，Ｃｍａｘ１．２７±０．３５μｇ／ｍｌ，ＡＵＣ５．４８±１．２９μｇ／ｍｌ．ｈ，Ｆ８５．４０±４．６９％。内服给药的药动学参数是：ｔ１／２Ｋａ０．２８±０．１５ｈ，ｔ１／２Ｋｅ３．１５±０．３６ｈ，ｔｍａｘ１．４６±０．１９ｈ，Ｃｍａｘ０．６５±０．１３μｇ／ｍｌ，ＡＵＣ３．９３±０．９９ｍｇ／ｌ．ｈ，Ｆ６１．０２±１０．９０％。肌注给药的生物利用度与内服比较，差异极显著（Ｐ＜０．０１）。 相似文献
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Annual herbage yields of grasses grown on sandy soils on Henderson Research Station seldom exccecîf 10 000 kg/ha dry matter, while on heavy clay soils yields of 18 000 kg/ha are consistently obtained with similar amounts of applied fertilizers. Eight grass species were established in sandy soil that had either not been fumigated or been fumigated with methyl bromide against soil nematodes. In the following season herbage dry matter yields increased from 13 280 kg/ha to 15 690 kg/ha due to fumigation, ou the average, while increases of 50% or more were obtained for three grasses. Yield reductions in two species may have been due to phytoloxic residues. Fumigation reduced the number of nematodes in the soil and in the grass roots. 相似文献
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The feasibility of establishing perennial forage legumes in veld has been investigated at Grasslands Research Station, Marandellas. Of the species tested, Stylosanthes guyanensis (stylo) appeared most suitable. Reduction of competition from veld grasses was essential for satisfactory establishment of the legume; this was best achieved by shallow discing which also produced a suitable seedbed. The density of stylo seedlings was affected by seeding rate and degree of soil preparation. More plants established from 4,5 kg/ha of seed broadcast onto disced soil than from 18,0 kg/ha sown onto undisturbed ground. Periodic grazing during the season of establishment had no effect on seedling density. Herbage yields followed the same trends as stylo density. Yields from the plots with the greatest density of stylo plants were more than twice those from the plots with the lowest density. Seeding stylo into disced veld raised dry matter yields 50% and crude protein yields 300%, although yields of grass were reduced by the addition of the legume. Annual applications of 112 kg superphosphate/ ha had no effect on yields. 相似文献
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甘肃引黄灌区根据农作物对水分的需求,通常在每年固定时期给水灌溉。本试验研究了甘肃引黄灌区不同灌溉次数(2,3,4次)和磷酸二铵施用量(0,180,360,540kg/hm2)对紫花苜蓿种子产量及产量构成因素的影响,旨在寻找该地区紫花苜蓿种子生产的合理灌溉次数和最佳施肥量。通过两年的研究发现,灌溉次数对紫花苜蓿种子产量具有极显著影响(P0.01),灌溉次数增加反而降低种子产量,2次灌溉对紫花苜蓿种子生产较为适宜,两年的平均值分别为686和891kg/hm2;种子产量随着施肥量的增加,呈现先升高后降低趋势,在施用360kg/hm2肥量条件产量最高,两年的平均值分别为631和786kg/hm2;灌溉次数和施肥量二者交互作用显著,在2次和3次灌溉条件下,施肥量增加显著提高种子产量;在4次灌溉条件下,随着施肥量增加呈现先上升后下降趋势;在2013年,2次灌溉、360kg/hm2施肥量条件下的种子产量最高,为757kg/hm2;在2014年,2次灌溉、540kg/hm2施肥量条件下的种子产量最高,为1019kg/hm2;苜蓿种子产量与单位面积生殖枝数、结荚花序数呈现显著正相关,相关系数分别为0.503和0.835;2次灌溉、360kg/hm2磷酸二铵施肥条件为该地区较为经济、高效的灌溉和施肥条件。 相似文献
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红豆草和紫花苜蓿在同仁县生产性状的初步比较结果 总被引：1，自引：0，他引：1
试验结果表明 ,在同仁县的隆务河谷地区有灌溉的条件下 ,红豆草在种植前两年的生长速度和产草、产籽量均明显高于紫花苜蓿。红豆草在种植当年就可以收到部分成熟种子 ,如果收草用 ,当年可刈割两茬 ,但越冬率较苜蓿差 ,第 2年可刈割三茬 ,每公顷产鲜草 962 82kg/hm2 ,产种子 1 1 35.5kg/hm2 。紫花苜蓿产鲜草 731 97kg/hm2 ,产种子 1 99.5kg/hm2 。红豆草较紫花苜蓿更适合于隆务河谷较阴湿的荒山荒坡 ,房前屋后及田埂地头上种植 ,既美化环境又可获取较高产量的牧草 相似文献
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L G Du Pisani W L J Van Rensburg D P J Opperman 《African Journal of Range and Forage Science》2013,30(3):109-112
Abstract The reaction of Anthephora pubescens to N, P and K fertilization was evaluated from 1976 to 1983. Dry matter production at N levels of 0; 75 and 150 kg/ha were 1,9; 2,2 and 2,3 ton/ha respectively. This relative poor reaction to N was related to rainfall variations and the initial low soil P status. A significant N × P interaction was recorded. Dry matter production increased from 1,6 ton/ha at the NO × PO treatment to 2,8 ton/ha at the 150 kg N/ha × 20 kg P/ha treatment. Anthephora responded poorly to K fertilization and the mean dry matter production was 2,1; 2,2 and 2,2 ton/ha with 0; 75 and 150 kg K/ha respectively. The mean crude protein content of A. pubescens increased from 6,5 % at the NO level to 8,8 % with 150 kg N/ha. The P content of plant material increased from 0,13 % at the PO level to 0,20 % with 20 kg P/ha. The Zn content of plant material dropped to sub‐optimal levels during the trial. 相似文献
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通过对阿尔冈金(Algonquin.)、金皇后(Golden Empress)、红豆草(sativa O.)引种试验。结果表明，播种当年可以刈割两茬，产量分别为：53026．5kg／hm^2、54164．4kg／hm^2、36063．5kg／hm^2；第二年鲜草产量分别为65027．8kg／hm^2、65067．2kg／hm^2,66281．6kg／hm^2，红豆草种子产量1101．1kg／hm^2。 相似文献
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Velázquez-Beltrán LG Felipe-Pérez YE Arriaga-Jordán CM 《Tropical animal health and production》2002,34(2):169-179
Campesino systems on hill slopes in Central Mexico rely on equids for multiple activities and have a problem in adequately feeding them. A participatory trial was conducted to evaluate the inclusion of common vetch in the traditional forage oat crop to improve its feeding value. An agronomic evaluation was undertaken by intersowing common vetch at 40 kg seed/ha with oats at 80–100 kg/ha in small plots, recording the yield and the chemical composition of the fresh forage in ten plots at harvest. The data were analysed as a completely random design, taking each farmer/plot as a treatment. A feeding trial compared the live weight of 7 donkeys fed oats and vetch against 17 donkeys fed traditional forage. There were differences between farmers in forage yields (p<0.01) that could not be explained as due to soil types or management. The mean yield of 31.0 t/ha of fresh forage of oats–vetch was 20.5% higher than that from monoculture, and had a higher crude protein content. Donkeys fed the oats–vetch were heavier (p<0.001). The farmers evaluated the oats–vetch association positively, appreciating the higher yields and good condition of their equids. The combination is an appropriate technology for these campesino farming systems. 相似文献
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磷、钾肥对蒙农红豆草种子产量和质量的影响 总被引：2，自引：1，他引：1
研究在北京地区施磷、钾肥对蒙农红豆草(Onobrychis viciaefoliacv.Mengnong)种子产量及质量的影响。结果表明:在一年内施肥总量相同的情况下,春季全施和秋/春(1/2)蒙农红豆草的种子产量高于秋/春(1/1)施肥试验的种子产量。春季全施试验中,施磷肥100 kg/hm2处理的种子产量为1 560 kg/hm2,显著高于其他处理(P<0.05);施钾肥180 kg/hm2处理的种子产量最低,为1 176kg/hm2。秋/春(1/1)施肥试验中,施磷肥100 kg/hm2处理的种子产量为1 357.3 kg/hm2,显著高于其他处理(P<0.05)。秋/春(1/2)施肥试验中,施磷肥100 kg/hm2处理的种子产量为1 519.6 kg/hm2,显著高于其他处理(P<0.05)。由相关分析可知,蒙农红豆草种子产量与单位面积的有效分枝数呈显著的正相关关系(R=0.955,P<0.05),而与每个枝条的花序数呈极显著的负相关关系(R=-0.991,P<0.01)。 相似文献
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对三种不同处理的紫花苜蓿进行栽培试验研究,在田间调查了幼苗高度、密度、鲜草产量、根瘤菌接种数.试验表明,出苗30天后,丸衣化处理的生长高度为22.3cm,极显著地（P＜0.01）高于未丸衣化的两个处理.在出苗密度上,播量为5.25kg/ hm^2丸衣化处理的苜蓿与播量为7.5kg/hm^2未丸衣化的两个处理的苜蓿基本相当.在鲜草产量上,丸衣化处理（251.5g/ m^2）低于未丸衣化但亩施复合肥10kg的处理（310g/m^2）,但高于未丸衣化亩施消毒鸡粪10kg的处理（158 g/m^2）.丸衣化处理后根瘤菌接种率（50.00％）是未丸衣化处理根瘤菌接种率（19.23％）的2.5倍. 相似文献