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为了探索不同施肥方法对香蕉枯萎病抗性及产量的影响,2013年在信宜市香蕉主产区水口镇进行了香蕉一次性施肥与常规性施肥试验研究。试验结果表明,采用一次性施肥技术比常规施肥技术增加产量19.35t/hm2;在抗枯萎病方面,采用一次性施肥技术种植的香蕉发病率只有5%,与常规施肥技术相比,抗病率提高了20%。
另外,在生产成本与经济效益方面,采用一次性施肥技术也具有成本低、经济效益、品质好等显著的特点。 相似文献
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针对广西玉林地区特色经济作物粉蕉、果蔗存在的严重连作障碍问题,探索水田合理轮作模式。采用3年2造粉蕉+2年2造果蔗或2年2造果蔗+3年2造粉蕉轮作模式,可有效降低香蕉枯萎病、果蔗宿根矮化病、花叶病的危害。轮作区粉蕉枯萎病发病率仅为0.33%,而连作区枯萎病发病率高达48.67%;果蔗轮作区宿根矮化病和花叶病均无发病,连作区宿根矮化病发病率为27.34%,花叶病发病率为27.33%,轮作区商品蔗的产量是连作区商品蔗产量的1.94倍。在发展特色区域经济作物时,采用3年2造粉蕉+2年2造果蔗模式或2年2造果+3年2造粉蕉轮作模式值得借鉴和大面积推广。 相似文献
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为探明香蕉根结线虫(Root-knot nematode)与香蕉枯萎病(Banana Fusarium wilt disease)发生的相关性。 本研究在云南香蕉生产区调查了20个蕉园的根结线虫危害程度和枯萎病发病率,并分别在1个蕉园,对5个品种及植株不同生育期进行连续跟踪调查。结果表明:枯萎病发病率与根结线虫危害程度有相关性。蕉园中枯萎病发病率最高的为35.8%,其根结线虫危害程度为2.7;枯萎病发病率最低的为2.5%,其根结线虫危害程度为0.8。两者的相关性方程为y=0.079x+0.346,相关系数为R=0.898;不同品种中感病品种“巴西”的枯萎病发病率最高,为61.8%;其根结线虫危害程度也是最高的,为2.1;抗病野生种“Pahang”未发现有枯萎病发生,其根结线虫危害程度也是最低的,为0.2。两者的相关性方程为y=0.029x+0.456,相关系数为R=0.923。不同生育期,从苗期到套袋期,枯萎病发病率和根结线虫危害程度的趋势是一致的,逐渐升高,套袋期达最高。结论:枯萎病发病率与根结线虫危害程度呈正相关。 相似文献
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据广西壮族自治区水果技术推广总站有关信息,为提高广西香蕉种植水平,加强广大蕉农对香蕉高产栽培技术和香蕉枯萎病的认识,进一步做好农业部南亚办香蕉枯萎病监测与防控项目管理,促进广西香蕉产业持续健康稳定发展,2008年10月17日,由香蕉枯萎病监测点实施单位——南宁市水果站举办的“香蕉高产栽培和香蕉枯萎病防治技术培训班”在该市举办。 相似文献
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在增施有机肥的基础上,研究不同种植模式-香蕉间作野花生、韭菜、行间稻草覆盖处理对香蕉根区土壤养分及可培养微生物数量的影响。结果表明:不同种植模式对香蕉根区土壤养分和可培养微生物数量的影响差异显著(P<0.05)。其中间作和稻草覆盖种植模式对香蕉根区有机质、pH值、土壤全N、速效P、速效K含量显著高于单作模式,最大增加比例分别为44.18 %、12.59 %、58.42 %、19.15 %和101.52 %,速效K的涨幅最大;间作韭菜和野花生模式显著提高了香蕉根区土壤中可培养细菌和放线菌数量,降低了尖孢镰刀菌数量;覆盖稻草处理使香蕉根区土壤中可培养的细菌、放线菌、尖孢镰刀菌数量均有所增加,但可能增加香蕉枯萎病发生的风险。相对于单一香蕉的栽培模式,蕉园间套作野花生和韭菜,有利于改善蕉园土壤理化状况及根区微域环境。 相似文献
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香蕉是广西的大宗水果 ,2 0 0 1年种植面积达6 13万hm2 ,产量达 112 96万t,占全区水果总产量的 2 7 5 9%,实现产值 15 6 1亿元 ,占全区水果总产值的 17 85 %。如今 ,广西香蕉的集中上市期 (2 0 0 2年 11月至 2 0 0 3年 1月 )即将到来 ,笔者对其产销形势作如下分析 ,仅供参考。1 生产形势 我国最大的香蕉主产省广东 ,由于去年香蕉价格低 ,今年全省香蕉种植面积减少 ,加上今年粤西、粤东等香蕉主产区遭受五六十年一遇的冬、春、夏连续干旱灾害 ,预计香蕉产量为 2 2 0万t,比上年减产 8万t。广西是我国第二大香蕉主产区 ,在去年… 相似文献
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Analysis of growth curves of fowl. I. Chickens. 总被引:4,自引:0,他引:4
1. The Richards function was used to describe the growth curves (n = 989) of 9 broiler lines. Chickens were fed ad libitum and body weight was recorded every second week from hatching to 26 weeks of age. 2. The accuracy of curve fit measured by the coefficient of determination (R2) was better for males than for females (0.9986-0.9995 vs 0.9972-0.9988, respectively). 3. The estimation of the asymptotic final weight (A) for different lines enabled the degree of maturity (ut = yt/A) to be determined at any fixed point of the curve. At the age of 7 weeks this had a value of 0.318-0.369 for cockerels and 0.325-0.377 for pullets and represented the slaughter maturity of individual lines. The ratio of inflection/asymptotic weight (y+/A = 0.370-0.388) indicated that in some cases chicken growth can be described approximately by the Gompertz function (y+/A = 0.368). 4. It was found that the age at the inflection point of curves (t+ 48.2-55.7 d for cockerels and t+ = 47.8-52.8 d for pullets) roughly corresponds to the slaughter age of the chickens. 5. The interline differences in the parameters of maturation rate for weight (y+/A, k, t+, u7) are low in comparison with the differences in body weight (A, y+, y7) and absolute growth rate (v, v+). 6. The intragroup phenotypic correlation among growth parameters and the importance of the mathematical models are discussed. 相似文献
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1. Growth curves of nine selected lines and one random-bred control population (in total, n = 1070) were evaluated by the Richards function. The ducks were weighed at 7-d intervals and, after the tenth week, every second week (up to 18 weeks). Food and water were supplied ad libitum. 2. The predicted curves closely fitted the weight data points (R2 = 0.9991-0.9997). 3. The ducks are characterized by early maturity rate. The peak of the absolute growth rate (the inflection point of the curve) occurred at 24.1-27.6 d of age (t+). A higher ratio of the inflection to the asymptotic weights (y+/A = 0.380-0.424) was found in comparison to those from the Gompertz-type function of growth (y+/A = 0.368). 4. In the selected lines the degree of maturity at a slaughter age of 7 weeks (u7 = y7/A) ranged from 0.784 to 0.835 for males and from 0.819 to 0.889 for females. 5. Ducks within the non-selected control line had a significantly lower maturing rate than the selected lines. 6. Sexual dimorphism was recorded for all growth parameters analysed. Females have faster maturation rate than males (higher values of y+/A, u7, k and a shorter auto-acceleration phase of growth). 7. High interline differences were found for body weight (A, y+, y7) and for absolute growth rate (v, v+) and smaller ones for parameters of the maturation rate (y+/A, u7, k and t+). 8. The intragroup phenotype correlation between growth parameters and the use of weight data only up to 7 weeks of age for the estimation of parameters of the Richards function are discussed. 相似文献