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1.
B. R. Watkin 《Grass and Forage Science》1957,12(4):264-277
The importance of the grass/clover balance of a pasture in determining the effects of manurial returns and fertiliser applications on the chemical composition of the sward is shown.
The response to applied nitrogen was very dependent on the presence or absence of the animal excrements. For example, the N recovery from an application of 18 cwt. per acre of nitro-chalk was only 2% in the absence but 68% in the presence of the grazing animal.
Urine caused a marked increase in the N and K content and the yield of pasture, particularly when returned in quantity to a high-producing grass-dominant sward, and at the same time tended to depress the Ca, P and Mg content. Urine K was superior to fertiliser K, per pound of K returned or applied, in raising the K content of the pasture.
By comparison, dung had little direct effect on chemical content; even when returned in large amounts it affected the Ca and K content of the pasture to a relatively small extent. The P returned in the dung had little effect on the P content of the pasture and was inferior to superphosphate in this respect.
Together, as in normal grazing, dung and urine tended to counter or enhance their individual effects.
There was a positive correlation between the Mg and P content of the pasture and a negative correlation between Mg and K. Brief mention is made of the possible importance of the nutrient balance in pasture as a factor in animal health. 相似文献
The response to applied nitrogen was very dependent on the presence or absence of the animal excrements. For example, the N recovery from an application of 18 cwt. per acre of nitro-chalk was only 2% in the absence but 68% in the presence of the grazing animal.
Urine caused a marked increase in the N and K content and the yield of pasture, particularly when returned in quantity to a high-producing grass-dominant sward, and at the same time tended to depress the Ca, P and Mg content. Urine K was superior to fertiliser K, per pound of K returned or applied, in raising the K content of the pasture.
By comparison, dung had little direct effect on chemical content; even when returned in large amounts it affected the Ca and K content of the pasture to a relatively small extent. The P returned in the dung had little effect on the P content of the pasture and was inferior to superphosphate in this respect.
Together, as in normal grazing, dung and urine tended to counter or enhance their individual effects.
There was a positive correlation between the Mg and P content of the pasture and a negative correlation between Mg and K. Brief mention is made of the possible importance of the nutrient balance in pasture as a factor in animal health. 相似文献
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Two experiments are described in which ground harley meal was added to freshly-cut grass hefore ensiling it in small air-tight metal containers and polythene containers. The mean DM loss from the air-tight metal containers was 1 % and from the polythene containers 18.8%. The silages were all of satisfactory fermentation quality, as assessed hy pH, voladle acids, lactic-acid and Tolatile-hase content. The addition of the harley meal significantly improved the nutritive content of the ensiled material, and the resulting silage in the air-tight metal containers. Sheep were used to measure the voluntary intakes of the silages conserved in the polythene containers. 相似文献
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植物健生素（x1）、喷施宝（x2）、高锰酸钾（x3）在马铃薯块茎膨大期喷施叶面，有明显增产效果。三者综合施用可使产量提高26．6％，分别单施x1可增产8．24％，x2增产10．91％，x3增产7．47％。三种药剂主要是通过促进平均单薯重的增加而实现增产的。x2特别有利于大薯和特大薯的形成，x3对植株病害有显著疗效。当施用过量时三者均有副作用，以x3药害最大，x2次之，x1最小。施用最佳剂量x1649．5g／hm2，x292．1ml／hm2，x3用0．26％的溶液。 相似文献
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栽培大豆品种间RAPD标记的多态性分析及聚类分析 总被引：8，自引：2，他引：6
应用从６０００多份大豆种质资源中筛选的２１个抗大豆花叶病毒病的品种或品系及７个感病的品种或品素,选用２０个随机引物,对总ＤＮＡ进行了随机扩增。有１８个引物扩增得得到了稳定的ＲＡＰＤ图谱。ＯＰＨ－０６和ＯＰＨ－１０未能扩增到ＲＡＰＤ产物。 相似文献
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E. A. Garwood 《Grass and Forage Science》1969,24(4):333-343
The number of tillers per unit area of pure swards of S23 and S24 perennial ryegrass, S37 cocksfoot, S48 timothy and of a S23 perennial ryegrass/white clover sward, were examined at intervals of 4 weeks during a period of two years. The monthly appearance of new tillers and the death of tillers of S23 and S24 ryegrass and S48 timothy were followed for 15 months. The studies were made with and without irrigation.
The number of tillers varied with season through the year. Tiller numbers increased rapidly in late winter or early spring, and then declined until midsummer. Numbers rose again between June and August. This seasonal pattern of tiller numbers was most marked in ryegrass and timothy and least in cocksfoot. The effect of irrigation on tiller numbers was variable, and usually small in relation to the overall seasonal fluctuations in tiller numbers, but dry soil conditions could delay an increase in tiller numbers between June and August. The relationship between seasonal fluctuations in tiller number and root growth of swards is discussed. 相似文献
The number of tillers varied with season through the year. Tiller numbers increased rapidly in late winter or early spring, and then declined until midsummer. Numbers rose again between June and August. This seasonal pattern of tiller numbers was most marked in ryegrass and timothy and least in cocksfoot. The effect of irrigation on tiller numbers was variable, and usually small in relation to the overall seasonal fluctuations in tiller numbers, but dry soil conditions could delay an increase in tiller numbers between June and August. The relationship between seasonal fluctuations in tiller number and root growth of swards is discussed. 相似文献
6.
大豆硬粒(种皮不吸水)性状是一个能在不良环境中保持种子质量和活力的重要种子性状。本文研究了用育种品系D86—4448(硬粒)与商用大豆品种A6297(正常粒)杂交后的硬粒性状的遗传模式及与其它性状的关系。F_2及其亲本植株人工脱粒后在蒸馏水中(温度为24℃)吸水24和48小时。24小时后,422株F_2群体中,226株硬粒,165株中间型,31株正常粒的分离很接近9:6:1的比例,表明硬粒性状受两个主基因控制(x~2=1.67,P>0.40),基因间有累加效应,硬粒对正常粒为显性。生育期、百粒重、种皮颜色和光泽与硬粒性状没有关系,荚的吸水性与种子的吸水性正相关。 相似文献
7.
为了提高橡胶树的抗灾能力,从1979年起在海南岛中部属偶发性重风微寒区的黎母岭山区,开展了组配抗逆高产的橡胶三合树的研究。经九年验证,选配出的GTI/PR107组合品系1—4割年平均亩产干胶51.6公斤,为对照无性系PR107的129％,开割率达83.2％,保存率达96.2％,已被评定为小规模推广等级;组配的GT1/RRIM600、GT1/RRIM623、GT1/PB/63、大岭485/RRIM600和大丰359/GT1等具有抗逆高产性状,是有希望的组合品系。 相似文献
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RFLP在大豆种质资源及遗传连锁研究中的应用 总被引：5，自引：0，他引：5
本综合论述了ＲＦＬＰ在大豆种质资源及遗传连锁研究中的应用。自８０年代后期ＲＦＬＰＹ以大上，现已明确了栽培大豆ＯＧｌｙｃｉｎｅ ｍａｘ），野生在豆（Ｇ．ｓｏｊａ）和半野生大豆（Ｇ．ｇｒａｃｉｌｉｓ）ＲＦＬＰ的变异性；、大量探针已被制备和筛选出来。利用Ｇ．ｍａｘ×Ｇ．ｍａｘ和Ｇ．ｍａｘ×Ｇ．ｓｏｊａ两类组合已绘制出含约５５０个基因座３０００ｃＭ的ＲＦＬＰ遗传连锁图。一些质量性状基因座和数量性状基因座 相似文献
9.
从(南农73-935×Beeson)F3株行和Co60γ射线辐照处理南农87C-38的M5株行分别发现2个育性异常材料NJS-18H、NJS-19H.后裔试验育性鉴定表明NJS-18H、NJS-19H不育株的雌性与雄性育性均不正常,不能正常结荚,可能为联会异常突变体,其不育性均受1对隐性基因控制.该2个突变体可能用作大豆雌雄配子发育及其相互遗传关系研究的材料. 相似文献
10.
大豆经酶解后可产生呈现鲜味的物质。为了研究产品中鲜味的来源及产生鲜味组分的主要组成,本研究以大豆分离蛋白为原料,经风味蛋白酶改性,感官分析后发现,水解度达到43％时的酶解液呈鲜较强、苦味较弱;该酶解产物过截留分子量为10000Da,6000Da,3000Da的超滤膜,分成四个组分,发现是平均分子量小于3000Da的肽组份,而大于3000Da和小于500Da的组分只有微弱的鲜味,苦味和涩味明显。研究结果同时发现该酶解产物与肌苷酸间有显著风味增强效果。 相似文献
11.
壳聚糖包衣大豆种子的萌发及幼苗的生理特性 总被引：17，自引：0，他引：17
用1％、2％及3％的壳聚糖包衣大豆种子，考查了种子萌发及幼苗的一些生理特性变化。结果表明：包衣种子的发芽率及发芽势提高，其幼苗根数、根瘤数、单株于物质及叶和根中光合产物积累、叶片光合速率及可溶性蛋白质含量均有所增加，其中以1％效果最好。 相似文献
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马铃薯可溶性蛋白、叶绿素及ATP含量变化与品种抗旱性关系的研究 总被引：12，自引：2，他引：12
对水分胁迫下马铃薯叶片部分物质和能量代谢指标的研究结果表明,在水分胁迫下叶片中可溶性蛋白含量明显增加;叶绿素a、叶绿素b、总叶绿素含量及叶绿素a/b比值与对照相比均有所下降;ATP含量有增有减,但品种抗旱性愈强,ATP含量愈高。叶片中可溶性蛋白含量、叶绿素a/b比值、ATP含量占对照百分率与品种抗旱性之间的相关系数r分别为+0.8750、-0.8509、+0.7945,P<0.01。因此,这些指标可用于马铃薯不同品种抗旱性的评定。 相似文献
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抗感菌核病油菜品种对草酸的吸收和转运差异 总被引：3，自引：0，他引：3
研究了菌核病抗性不同的油菜品种对草酸的吸收和转运差异。经预处理后的3～4叶期油菜苗的根放进14C—草酸钾浓液（pH5）中，在20±0．2℃，6000Lux下处理4h。草酸钾浓度和放射性比度分别为5mmol／L和5μCi／ml。放射自显影和放射性强度测定结果表明：油菜对草酸有明显的吸收作用，高抗品种，如中R－888其放射性物质主要分布在叶脉中，表现为限制放射性物质的转运；感病品种，如84039放射性物质在叶片中分布较均匀。高感品种吸收的放射性物质是高抗品种的4倍以上，低抗和低感品种介于高抗和高感品种之间。 相似文献
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利用盆栽法研究稀土溶液浸种对向日葵生长及生理活性的影响。试验结果表明,适宜浓度(0.3％)的稀土溶液能够促进向日葵的生长,增加株高,扩大叶面积,刺激根系发育,有利于干物质积累。同时,稀土对叶片中各种光合色素的含量和某些生理生化特性有提高和促进作用。 相似文献
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张定选 《中国油料作物学报》1997,(4)
芝麻高产栽培的主要生理基础是品种群体植株的极性分布合理、配置方式中的效应值高、“三花’临界期及“断顶优势”利用充分，终生期于物质均衡分配。在技术上，应抓好品种“三优”利用、早播、疏密种植、磷钾辅氮、“三峰期”控制及适期小打顶、适当晚收。采用规范化技术产量可达1125～1500kg／hm2，增产99．8％，一级产品率达到63．2％。 相似文献
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发育中的花生种子子叶和胚轴在内源ＡＢＡ含量和贮藏蛋白合成等方面均有明显的差异性．子叶的发育与种子萌发能力形成有密切关系，胚轴的发育和种子活力的提高高度相关．子叶内存在ＡＢＡ的Ｃ４０途径，胚轴内存在Ｃ１５途径，随着种子的发育，胚轴ＡＢＡ含量迅速提高并可能向子叶转移，ＡＢＡ促进了贮藏蛋白质的合成． 相似文献