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Growth Kinetics of Vegetative and Reproductive Organs of Guava(Psidium guajava L.)in Iguala Guerrero,Mexico

Agricultural Sciences 2014年第14期5卷 1468-1475页

作者： Agustin Damian Nava Victor A.Gonzalez Hernandez Manuel Nava Jaimes Elias Hernandez Castro Dolores Vargas Alvarez Gemima Diaz Villasenor Francisco Palemon Alberto Blas Cruz Lagunas Academic Unit of Agricultural and Environmental Sciences The Autonomous University of GuerreroGuerreroMéxico Institute of Genetic Resources and Productivity Graduate CollegeTexcocoMexico

In the Mexican tropics the guava trees can grow and produce in any season, so they can be har-vested out of the period of high competition marketing (Summer). It?studied the growth kinetics of leaves and fruits of guava trees at the dry tropical conditions of the State of Guerrero, in guava trees of four years old and was evaluated a non-destructive method for measuring leaf area from November to May. 100 sheets of 10 randomly selected trees were cut. It was found that leaf length X the width X 0.72581647 (conversion factor) gave an estimated leaf area which?was significantly correlated with that obtained by the integrator of leaf area. Both in length and width the leaf growth kinetics were sigmoid with three growth stages: In Stage I (15 days) leaves grew 21.2% and 21.5%;in Stage II (26 days) grew 73.6% and 68%;and in Stage III (30 days). They Increased 5.2% and 10.5% in the primary and secondary sprouts. The fruit growth in its equatorial and polar diameters corresponded to a double sigmoid kinetics. In Stage I (61 days) it reached 1.9 and 2.3 cm;in Stage II (62 - 102 days) it reached 3.09 and 3.62 cm;and in Stage III (103 to 126 days) it reached 4.63 and 5.13 cm, as well the physiological maturity of fruit.

关键词： Psidium guajava Growth Kinetics phenological events

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Phenology and Vegetative Growth in a New Production Region of Grapevines:Case Study in Sao Joaquim,Santa Catarina,Southern Brazil

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Open Journal of Ecology 2014年第6期4卷 321-335页

作者： Marcelo Borghezan Larissa Villar Tatiane Carine da Silva Monica Canton Miguel Pedro Guerra Claudia Guimaraes Camargo Campos UFSC—Universidade Federal de Santa Catarina FlorianopolisBrazil UDESC—Universidade do Estado de Santa Catarina LagesBrazil

In Brazil winemaking is expanding not only in the renewal of vineyards in traditional production areas, but also in the introduction of new crops in the newer winemaking regions. Promising characteristics were observed in the quality of the grapes and wines produced in altitude regions of Santa Catarina. The aim of this study is to characterize the geographic and climatic conditions which affect the phenology and vegetative growth of grapevine in S?o Joaquim, in the mountains region of Santa Catarina. The vineyards are located in areas with undulated and strongly undulated relief, predominantly in soils originating from basaltic rocks, in climate conditions classified as Cfb according to the K?ppen, as Region I according to Winkler classification. The phenological stage of the grapevines in the S?o Joaquim region begins later and lasts longer in comparison to other winegrowing regions in Brazil. Decrease in photoperiod and low temperatures (<10?C) were the determining factors for the induction of growth cessation of the shoots in S?o Joaquim. The geographic location in a lower latitude and its high altitude results in a distinct growing climate compared to the other winegrowing regions in Brazil.

关键词： Vitis vinifera L. Climate Characterization phenological events Ecophysiology

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Vermicompost and Cow Dung Admixture Increases Rhizosphere Bacterial Population and Promotes Rapid Physiological Maturity in Maize (Zea mays L.)

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NASS Journal of Agricultural Sciences 2019年第2期1卷 27-36页

作者： Priya Chatterjee Paramita Mandal Sudipto Mandal Soumendranath Chatterjee Department of Zoology The University of BurdwanBurdwan713104India Ecology and Environmental Modelling Laboratory Department of Environmental ScienceThe University of BurdwanBurdwan713104India Parasitology and Microbiology Research Laboratory Department of ZoologyThe University of BurdwanBurdwan713104India

Incessant application of chemical fertilizers to the agricultural fields may alter the composition and activities of soil ***,the shift of cultivation practices from chemical to organic is considered to be the need of the hour in order to maintain soil health.A study was conducted in the agricultural fields of the University of Burdwan,India to observe the impact of organic manure on the rhizosphere bacterial *** experiments were conducted on maize plants,supplemented with the recommended dose of chemical fertilizer and organic manure(vermicompost and cow dung mixture).Corresponding changes in the plant phenological events and soil health in terms of soil physico-chemical factors and rhizosphere bacterial groups up to the level of CFU g-1×105 dry soil was *** results showed a significant increase in population of phosphate solubilizing bacteria during ***,at 90 DAS,significant increase in the population of phosphate solubilizing bacteria,nitrifying bacteria,asymbiotic nitrogen-fixing bacteria and protein hydrolyzing bacteria was observed in the organically treated *** growth of rhizosphere bacteria was attributed to the type of organic manure supplied to the agricultural *** addition,a strong correlation was observed between Zn and protein hydrolyzing *** soil organic carbon and available nitrogen were strongly correlated with nitrifying,fat solubilizing and phosphate solubilizing groups of bacteria.

关键词： Chemical fertilizer Organic manure phenological events Physico-chemical factors Rhizosphere bacteria

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