兔对桂牧1号杂交象草营养成分的消化率

试验测定了桂牧1号杂交象草{[(Pennisetum purpureum.cv.Mott)×(P.americanum×P.pu-rureum)]cv.Guimu No.1}的营养成分及消化率,其营养成分为:粗蛋白(CP)13.95%,粗纤维(CF)30.63%,粗脂肪(EE)2.72%,无氮浸出物(NFE)41.99%,粗灰分(ASH)10.72%,钙(Ca)0.61%,磷(P)0.42%。兔对桂牧1号杂交象草营养成分的消化率分别为:CP 76.79%、CF 42.26%、EE 80.23%、NFE 58.42%、ASH43.17%、Ca 45.52%、P 22.30%。表明桂牧1号杂交象草营养丰富,各种营养成分能很好地被兔消化利用。

刈割时间对桂牧一号杂交象草生长性能和品质的影响

采用单因素随机试验设计,研究了不同刈割时间对桂牧一号杂交象草(Hybrid Pennisetum ur-pureum Guimu-1)生长性能和品质的影响。结果表明,60 d刈割桂牧一号的株高、叶长、叶宽、分蘖数、茎叶比最高,显著高于其他处理;鲜草、干草、粗蛋白和粗纤维总产量以60 d刈割最高,分别为5 526.6 kg/667m2、1 005.9 kg/667m2、128.8 kg/667m2和298.8 kg/667m2;干草中粗蛋白含量为40 d刈割>50 d刈割>60 d刈割,粗纤维含量则相反。

不同施肥量对桂牧一号产量及氮磷钾吸收的影响

为了找到南方稻田种植桂牧一号的适合氮磷肥料配比,以湖南省长沙县金井镇循环农业科技工程基地试验田为平台,通过大田试验,研究不同施肥量对桂牧一号产量及养分吸收的影响。试验设N0P2K、N1P2K、N2P2K、N3P2K、N4P2K、N2P0K、N2P1K、N2P3K共8个处理。结果表明:基肥施用氮、磷肥尤其是氮肥对桂牧一号有明显增产作用,追施氮肥可以明显促进桂牧一号的再生。桂牧一号基肥施用,氮肥最佳施用量(折纯)为677.5 kg/hm2,磷肥最佳施用量(折纯)为100.4 kg/hm2。氮、磷肥的施用都可以增加桂牧一号氮吸收量,氮肥的作用较磷肥强。氮、磷肥的施用都可以增加桂牧一号的磷吸收量,磷肥的作用较氮肥强。氮、磷肥的施用可以增加桂牧一号的钾吸收量。

南方三种暖季型牧草品种的比较研究

对台湾甜象草、桂牧一号杂交象草、皇竹草进行了为期两年的比较试验研究。结果表明,三个牧草品种均能适应试验环境条件。甜象草、桂草、皇竹草的鲜草年产量分别为220.85t/hm2,163.18t/hm2,186.20t/hm2;粗蛋白含量分别为17.39%,19.02%,20.91%,粗脂肪含量分别为6.37%,5.39%,4.69%;粗纤维含量分别为33.49%,32.22%,33.58%。台湾甜象草较耐寒,越冬后恢复生长快,抗性较强,试验期间未发现病虫害,是一种高产优质的牧草,值得推广应用。

Comparative Study of Three Warm-season Forage Varieties in Southern China

The plant height,tiller number,yield of three warm-season forage varieties in Southern China were studied for consecutive two years.The result showed that the three varieties all adapted to the environmental conditions.The annual fresh grass yield of Pennisetum purpureum Schum ev.Taiwan,Guimu-1 hybrid P.purpureum and P.sinese Roxb were 220.85,163.18,186.20 t/hm^2;the crude protein content were 17.39%,19.02%and 20.91%;the crude fat content were 6.37%,5.37%and 4.69%;and the crude fiber content were 33.49%,32.22%and 33.58%,respectively.P.purpureum Schum ev.Taiwan had stronger cold resistance,fast growth after overwintering and strong resistance,and no plant diseases and insect pests were found during the test.P.purpureum Schum ev.Taiwan is a high yield and high quality forage variety,which is worth popularizing and applying.

桂牧1号杂交象草选育研究

以从美国引进的高产杂交狼尾草Ｆ１为母本、优质的矮象草为父本进行有性杂交，杂交后代经多年的选育，育成比亲本质量更好、产量更高的杂交象草———桂牧１号。该草鲜草产量比母本、父本分别增产２６％和５５．２％；粗蛋白质含量比父本提高３．１５％，比母本提高３３．１６％；赖氨酸含量１．１４％，是一种高产高效新型牧草。