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高寒地区一年生人工草地地上生物量动态及光能转化效率 总被引：12，自引：3，他引：9
对燕麦单播草地、燕麦+箭舌豌豆混播草地牧草组成及地上生物量动态,光能转化效率进行了观测和分析。试验结果表明,混播草地的两组分在生长发育节律和牧草产量积累过程方面均存在着较大的差异,箭舌豌豆与燕麦干物质之比随牧草生长发育的进展而逐渐增大。2种草地的干草产量在牧草生长期间差异不显著。8月中旬,单、混播草地干物质分别可达10.19、11.74t/hm2,地上净初级生产力分别为18874.69、21204.79kJ/(m2·a),光能转化率分别达0.3502%、0.3922%。 相似文献
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Effects of Tillage and Fertilization on Biomass, Roots, N-Accumulation and Nodule Bacteria of Vetch (Vicia sativa cv. Alexander) 总被引：1，自引：0，他引：1
N. Sidiras C. Avgoulas D. Bilalis N. Tsougrianis 《Journal of Agronomy and Crop Science》1999,182(3):209-216
Field experiments were conducted to determine the effects of tillage (ploughing followed by one rotary hoeing (CT), rotary hoeing (MT) and no-tillage (NT)) and type of fertilization (NP 154/75 kg ha−1 , digested farmyard manure 30 t ha−1 ) on growth (biomass and roots), N-accumulation and nodulation of vetch plants (Vicia sativa cv. Alexander) at different stages. The highest dry matter yields and root weight were determined for the NT and the lowest for the CT systems. The NT system promoted nodulation of vetch plants to a higher degree than the MT and CT systems. At the time just before harvesting, the N-accumulation in the above ground plants, was 54.3 for CT, 76.7 for MT, and 109.0 kg ha−1 for NT, and the corresponding values at roots were 73.3, 112.0 and 173.3 kg ha−1 . Growth and nodulation of vetch plants was in general much better on farmyard manure plots than it was with the NP fertilization. The closest correlation coefficients between dry matter of biomass and roots on the one hand, and number of nodules and percentage N in roots on the other, were found with NT. The highest correlation between nodulation and percentage N in roots (r = 0.91***) was observed at the 128-days-old vetch plants. The highest correlation between the number of nodules and percentage N in biomass (r = 0.82**) was found at the beginning of the plants' flowering period. *, **, *** indicate significance at P = 0.05, 0.01 and 0.001 respectively. 相似文献
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Effect of supplementing urea-treated barley straw with lucerne or vetch hays on feed intake,digestibility and growth of Arsi Bale Sheep 总被引：1，自引：1，他引：0
The study was conducted at Sinana Agricultural Research Center, Ethiopia to assess the supplementation of graded levels of
vetch (Vicia dasycarpa `lana’) and lucerne (Medicago sativa,’ Hunter river’) hay on feed intake, digestibility and body weight (BW) change of Arsi-Bale sheep fed urea treated barley
straw (UTBS). A 7 day- digestibility and a 90 day- feed intake trials were conducted using 28 and 35 sheep, respectively.
The experimental design was a randomized complete block design with seven dietary treatments that consisted of feeding UTBS
(T1) as the control treatment, UTBS plus 150, 250 and 350 g dry matter (DM) per day of vetch for T2, T3, T4, respectively
and UTBS plus 150, 250 and 350 g DM per day of lucerne for T5, T6 and T7, respectively. Intake of UTBS was not affected (P > 0.05)
by inclusion of lucerne hay at 25–35% of daily DM intake. The supplements increased daily intake of total DM, organic matter
(OM), neutral detergent fiber (NDF), acid detergent fiber (ADF) and metabolizable energy (ME) (P < 0.001) as well as apparent
digestibility of DM, OM (P < 0.001), NDF (P < 0.01), ADF, crude protein (CP) (P < 0.05) and daily BW gain (P < 0.001). Supplementation
with lucerne than vetch hay promoted higher (P < 0.001) CP and ME intakes and daily BW gain. Feeding with the UTBS without
supplementation was enough to meet the maintenance requirements of the sheep and allow small BW gain. The results of the study
showed that urea treatment of barley straw in conjunction with supplementation of lucerne or vetch hay could serve as a useful
strategy in improving smallholder sheep production in the tropics. 相似文献
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绿肥紫云英与化肥配施对双季稻区水稻生长及产量的影响 总被引：4，自引：1，他引：3
[目的]在双季稻区紫云英与水稻轮作制度下,探讨化肥配施紫云英对水稻产量及其构成因素的影响。[方法]采用田间定位方法,进行早稻和晚稻施肥效应试验,探讨水稻产量构成因素与不同施肥处理的关系。[结果]施肥可促进水稻生长和产量提高,化肥配施绿肥也能够显著地增加水稻产量。早稻化肥减量40%配施60%绿肥处理的下茬晚稻产量最高,而2008年晚稻以及2009早稻产量甚至显著高于100%化肥处理,2年早稻平均产量比100%化肥处理增加了247 kg/hm2,提高了3.8%。[结论]种植和利用紫云英可部分替代化学肥料,提高水稻产量,节约生产成本,提高有机-无机养分资源利用效率。 相似文献
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一年生混播草地生物量和品质以及种间竞争的动态研究 总被引：14，自引：2，他引：14
研究单播和混播燕麦和箭Ｋｕｏ豌豆草地生物量、品质及种间竞争动态。结果表明,生育期间除蜡熟期、成熟期外、单播燕麦产草量均高于其它处理。燕麦５０％＋箭Ｋｕｏ豌豆５０％混播处理在蜡熟期、成熟期产草量最高。从开花期开始,各处理单位面积粗蛋白质产量均显著（Ｐ〈０．０５）高于单播燕麦,而中性洗涤纤维（ＮＤＦ）、酸性洗涤纤维（ＡＤＦ）含量均低于单播燕麦。燕麦蜡熟期和简明Ｋｕｏ豌豆结荚期是饲草最佳刈割期。以燕麦２ 相似文献
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以光叶紫花苕(Vicia villosa var. glabrescens)为材料,探讨添加剂处理对其青贮品质的影响。试验设置对照(CK)、添加20 g·kg-1和50 g·kg-1的糖蜜(M1和M2)、添加5×105 CFU·g-1和1×106 CFU·g-1的乳酸菌(L1和L2)、添加20 g·kg-1+5×105 CFU·g-1和20 g·kg-1+1×106 CFU·g-1的糖蜜与乳酸菌混合剂(M1L1和M1L2)、添加50 g·kg-1+5×105 CFU·g-1和50 g·kg-1+1×106 CFU·g-1的糖蜜与乳酸菌混合剂(M2L1和M2L2)共9个处理组,贮存60 d后测定青贮的发酵品质与养分含量。结果表明:单独添加糖蜜组以及乳酸菌和糖蜜混合添加组的粗蛋白、可溶性糖、乳酸、乙酸含量均明显高于对照组(P<0.05),且pH和氨态氮含量显著低于对照组(P<0.05),其中M2处理组显著降低了中性洗涤纤维含量(P<0.05),M2L1和M2L2处理组显著降低了中性洗涤纤维和酸性洗涤纤维含量(P<0.05);单独添加乳酸菌除了对青贮饲料的pH有显著影响外(P<0.05),对其他青贮指标没有显著影响。综合各项指标表明,乳酸菌和糖蜜混合添加剂能显著提升含糖量低的青贮饲料品质。 相似文献
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凉山光叶紫花苕生物性状与影响草、种生产因素的分析 总被引：3，自引：1，他引：2
对凉山光叶紫花苕Vicia villosa多生态观测分析,低山河谷区、二半山区秋季播种可完成全部生育过程,高寒山区越冬率低,随海拔增高植株性状表型值出现明显差异;经性状相关程度通径分析得出,影响产草的主要性状是叶质量和分枝长度,影响产种的主要性状是单株质量、结荚数、分枝长度;单株产种量及种子质量低山河谷区优于二半山区,原种生产区宜建在凉山低山河谷区。研究得出8月底前播种为适宜期,生产草适宜用种量60~105 kg/hm2,生产种子适宜用种量为22.5~37.5 kg/hm2,生产种子应采用冬前刈割1次后留种,生产草在冬前刈割1次,开春后刈割1~2次。 相似文献
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高寒地区燕麦及其混播草地最佳刈割期的研究 总被引：2，自引：0，他引：2
通过对燕麦单播及其与箭豌豆混播群落不同物候期的产草量,粗蛋白质产量,中性洗涤纤维（ＮＤＦ）、酸性活活纤维（ＡＤＦ）含量动态研究,结果证明,燕麦单播及其与豆科牧草混播的最佳刈割期应科乳熟末期－蜡熟期和箭Ｋｕｏ豌豆结荚期,而不是抽穗期,开花期。 相似文献