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1.
A guava based intercropping systems comprising of nine intercrops such as mango ginger, turmeric, tomato, cowpea, frenchbean, ragi, niger, upland paddy and control (without intercrop) was conducted to study the influence of various intercropping systems on plant and soil health of guava orchard. The results revealed that guava + cowpea system showed significant improvement in bulk density, electrical conductivity, water holding capacity, organic carbon content and pH of orchard soil. The guava + cowpea system also recorded significantly maximum available nitrogen and potassium content in the soil, whereas the maximum available phosphorus content were obtained in guava + mango ginger system. The nitrogen, phosphorus, and potassium (N, P and K) content of guava leaf were found to be maximum under the guava + cowpea system. The fruit yield of guava was recorded highest in guava +cowpea intercropping system. However, the total soluble solids (TSS) and acidity of fruits were not affected by the intercropping systems.  相似文献   
2.
利用"Y"型嗅觉仪在实验室测试了10种番石榴挥发物对橘小实蝇性成熟和性未成熟的雌、雄成虫的引诱作用,并比较了不同浓度的挥发物混合液在田间对橘小实蝇的引诱效果.结果表明,乙酸乙酯、异戊酸、乙酸异戊酯、丙酸乙酯和β-石竹烯对橘小实蝇性成熟和性未成熟的雌、雄成虫具有引诱作用,且不同剂量挥发物的引诱力存在差异,对橘小实蝇性成熟...  相似文献   
3.
杨明  胡文娥  黄剑波  吴彩院 《安徽农业科学》2010,38(31):17796-17797
[目的]采用超声波法提取番石榴果实中的果胶,探讨提取工艺条件。[方法]测定了提取液pH值、超声功率、超声时间、料液比、提取温度对果胶得率的影响,进行了单因素试验和正交试验。[结果]在提取液pH值为2.0、超声功率为70%、超声时间为30min、料液比为1:30、提取温度为50℃条件下,效果最佳,果胶得率达19.5%。[结论]采用超声波辅助法提取番石榴果胶工艺是可行的,超声波破壁可降低提取温度,提高果胶得率及安全性。  相似文献   
4.

Sampling theory was combined with resampling techniques to determine the number of location-years needed for estimating an insect's required thermal summation and lower developmental threshold from field-based studies. This was done by analysing 19 location-years of field observations on the first emergence of Apthona nigriscutis Foudras, an important biological control agent of the noxious weed, leafy spurge (Euphorbia esula L.). Results indicated that 5 - 7 location-years were needed to estimate that insect's mean required thermal summation and mean lower developmental threshold for predicting first adult emergence. However, if the wish was to estimate the median required thermal summation and median lower developmental threshold for that purpose, then 8 - 11 location-years were needed to obtain acceptable estimates of those parameters. The implications of these and other findings are discussed.  相似文献   
5.
Cashew apple and guava residues from fruit juice industry were prepared as dehydrated fruit powders and used at different levels of wheat flour substitution for cookies formulations. The effects of guava and cashew apple fruit powders supplementation on physicochemical and sensorial characteristics of the cookies were evaluated. The pH, fibre and protein content were significantly affected. Biscuits with 15 g and 20 g/100g cashew apple and guava fruit powders showed the highest scores for sensorial attributes, respectively. The supplementation seems to be suited for wheat flour substitution and it is possible to obtain cookies with value-added food ingredient within the standards.  相似文献   
6.
低温胁迫下番石榴叶片生理生化变化的探讨   总被引:3,自引:0,他引:3  
通过不同低温对台湾引进的珍珠番石榴、无籽番石榴及福建省乡土番石榴的处理 ,测定其在低温胁迫下叶片若干生理生化变化 ,以探求番石榴不同品种的抗寒性与忍受的临界低温。结果表明 ,番石榴忍受的临界低温为 -3~ -4℃ ,因品种和低温持续时间而异。番石榴不同品种间耐寒性差异与叶片束缚水 自由水比值以及可溶性蛋白质、可溶性糖含量相关。乡土番石榴的抗寒性高于从台湾引进的两个品种。  相似文献   
7.
Investigation of four guava cultivars showed that when the fruits were harvested at different stages of growth and development, total sugars increased slowly during the initial growing period followed by rapid increase during maturation and repining for all cultivars. The maximum level varied from 7.5 to 26.9%. Individual sugars: (fructose, glucose and sucrose) increased slowly during the initial growing period followed by rapid increase during maturation and ripening for all cultivars. The cultivars differed in their final sugar content; fructose varied from 5.6 to 7.7%, glucose from 1.9 to 18.1%, and sucrose from 6.2 to 7.8%. Total ash for all cultivars decreased slowly during the initial growing period followed by a sudden increase in the latter stage of maturation and ripening, with maximum level varying from 5.2 to 7.9%. Minerals: Ca, Mg, Na, K and P, for all cultivars decreased slowly during all stages of development. These results suggest that when guava fruits were picked 106–126 days after fruit set it ensures sufficient amount of total sugars and appreciable amount of minerals.  相似文献   
8.
广州地区番石榴病害鉴定   总被引:2,自引:1,他引:1  
根据近几年对广州地区番石榴病害调查,初步鉴定出番石榴病害13种;真菌病害12种,藻类病害1种。其中果实病害7种,叶斑类6种。果实上以炭疽病严重,其次为褐腐病。黑腐病(Botryodiplodia theobromae Pat.);褐腐病(phomopsis psidii de Camara);茎点霉果腐病(phoma psidii Ahmad);果褐点病(Cercospora psidii Rengel);褐污斑病(Mycovellosiella myrtacearum A.N.Rai et al );叶斑病(phyllosticta psidii.Tassi);叶枯病(phomopsis destructum D.P.C. Rao,Agrawal et Saksena);灰斑病(pestalotiopsis disseminatum (Thuem.)Stey.)8种病害系国内首次报道。3种病原为新种,将另文发表。本文最后讨论了有待于进一步研究的问题。  相似文献   
9.
冬季红宝石与新世纪番石榴叶片光合特性比较   总被引:4,自引:0,他引:4  
以红宝石和新世纪番石榴为材料,对其叶片光合特性及光合色素含量等的差异进行了比较研究。结果表明,红宝石番石榴叶片净光合速率在一天的生长过程中除18:00时,都低于新世纪,叶片气孔导度、胞间CO2浓度、蒸腾速率等都低于新世纪;但红宝石叶片的可见光吸收能力,叶绿素、类胡萝卜素、花青苷含量,叶片比干质量、比鲜质量等,都分别比新世纪的高,尤其是花青苷,其含量是新世纪的46.47倍。  相似文献   
10.
不同修剪和疏果措施对番石榴产量及果实品质的影响   总被引:1,自引:0,他引:1  
修剪措施对番石榴新梢形成及产量提高效果显著,其中中梢修剪的新梢形成数量及产量最高。疏果措施即留单果、留双果对增加果实单果重、可溶性糖含量效果显著;对果实硬度、可滴定酸含量无明显效果;留单果对增加维生素C含量效果显著,留双果与对照没有显著差异。  相似文献   
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