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银杏为我国传统的名贵树种,其生长缓慢、结实晚,一般要20多a才能开花结实,并且产量低。阐述银杏的生物学特征、繁殖方式、栽培管理方法、修剪整形及病虫害防治等实用技术,旨在为扩大银杏园林生产、提高银杏的种植质量和产量提供有益的参考。 相似文献
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蔬菜的质量和安全日益受到人们的关注,无公害蔬菜已成为蔬菜生产的发展方向。本文简述了无公害蔬菜的概念,分析了烟台市无公害蔬菜的生产现状及存在问题,提出了无公害蔬菜生产的措施与对策,以期为烟台市无公害蔬菜的生产提供参考。 相似文献
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笼底材料、密度和性别组群对肉鸡胸囊肿发生及胸肌成分的影响 总被引:1,自引:2,他引:1
该研究采用了三因素三水平的正交试验设计,就笼底材料、饲养密度、性别组群等三因素对3~6周龄笼养AA肉仔鸡发生胸囊肿及对其胸肌成分的影响进行了研究。结果表明:铁丝笼底、高饲养密度(17.25只/m2)、公鸡组的发病率最高,平均达34.09%,并显著高于其他组(P<0.05)。铁丝笼底显著高于塑料和竹竿笼底(P<0.05),高密度(17.25只/m2)显著高于低密度(10.98只/m2)(P<0.05),笼底材料是导致胸囊肿发病的主要环境因素,而性别组群对其无显著影响(P>0.05)。不同笼底下胸肌水分和蛋白质含量以竹竿笼底的含量最高,铁丝笼底下的胸肌蛋白含量最低(P<0.05)。胸肌脂肪则不受笼底、密度和性别组群的影响。因此,该试验表明,竹竿笼底和塑料笼底材料可降低笼养肉仔鸡胸囊肿的发病率,有利于提高其胸肌品质。 相似文献
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Weiwei Zheng Feng Chen Heng Zhai Yuehua Xu Jing Zhang 《Frontiers of Agriculture in China》2007,1(4):460-467
A two-year trial was conducted to test the interactive effects of special-for-apple organic fertilizer, CaSO4, and amino acid Ca on Fuji/Balenghaitang (Malus robusta Rehd.) rootstock in Burozem soil in China. Total Ca, exchangeable Ca, and fruit Ca were significantly improved by the soil
application of CaSO4 with the highest exchangeable Ca and fruit Ca observed in Fuji apple trees treated at the rate of 3.5 kg CaSO4 per tree. 3.5 kg CaSO4 was divided into two applications, with first application in the first month after full bloom, and the second in the second
month after full bloom in summer, progressively to improve fruit Ca concentration. Dividing CaSO4 into two applications in combination with organic fertilizer or amino acid Ca spray, proved to be more effective on improving
the fruit Ca concentration, with the highest level of 179.17 mg/kg FW in Fuji apple trees treated with 2 kg CaSO4 applied and amino acid Ca sprayed in the first month after full bloom, 1.5 kg CaSO4 applied in summer, organic fertilizer applied in winter. Organic fertilizer applied in winter alone remarkably improved the
fruit Ca concentration, as well as storage Ca in roots and stems, and the best effect was observed in Fuji apple trees which
were supplemented organic fertilizer (10 kg) in winter and CaSO4 (1 kg) in the first month after full bloom per tree. The effect on Ca increment became less pronounced when the amount of
organic fertilizer reached 15 kg or CaSO4 was more than 3.5 kg per tree. There was a positive correlation between the Ca/Mg ratio in soil and fruit, exchangeable Ca,
and fruit Ca concentration, while a negative correlation was observed between the N/Ca ratio in fruit, available P, available
K in soil, and fruit Ca concentration. Both N/Ca ratio and Ca/Mg ratio in fruit were affected by different fertilization regime,
and bitter pit incidence at the end of storage kept acceptable only if N/Ca < 17 and Ca/Mg ≥ 7 at harvest. The commercial
fertilization regime turned out to be organic fertilizer in combination with CaSO4 applied in soil in winter, amino acid Ca sprayed in the first month after full bloom, and CaSO4 applied in soil in summer.
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Translated from Journal of Fruit Science, 2007, 24(1): 6–10 [译自: 果树学报] 相似文献
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该本文采用三因素三水平正交试验设计,就笼底材料、饲养密度、不同性别组群下3~6周龄AA肉仔鸡的生产性能及其胴体品质进行研究。结果表明:竹竿和塑料笼底下肉仔鸡的胴体品质以及笼养密度11 ~14只/m2下的生产性能较高,以塑料笼底、低密度和公鸡单饲组的肉仔鸡总增重最高,达1.82kg。笼底材料对增重、饲料转化率、屠宰率、腹脂率以及胸肌纤维直径没有影响,但铁丝笼底会导致胸囊肿发病率升高。高饲养密度下能显著降低肉鸡增重和饲料转化率,但肉仔鸡的屠宰率有所增加;而低饲养密度有利于胸肌纤维直径的增加。单饲母鸡的腹脂率显著高于单饲公鸡和公母混群饲养鸡的腹脂率。 相似文献
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