Coberturas vegetais e doses de nitrogênio, associadas à inoculação com Azospirillum brasilense, no cultivo do milho na região de Cerrado

Pós-graduação em Agronomia - FEIS

Manejo da fertirrigação e salinidade do solo no crescimento da cultura da beterraba

With the increase in world population and scarcity of natural resources, efficient use of fertilizers becomes necessary for intensive agriculture. The experiment was conducted in a greenhouse at the Department of Agricultural Engineering, UNESP in Botucatu-SP. The treatments were derived from the combination of the soil salinity (E.C: 1.0, 3.0, 6.0, 9.0 and 12.0 dS m-1), Fertigation management (M1 =traditional and M2 = with control of the ionic concentration of the soil solution) and beet cultivars (C1= Early Wonder and C2 = Itapuã) in a 5x2x2 factorial design with four replications in a randomized block design. Throughout the cultivation, the following variables were evaluated: height, stem diameter, length and diameter of plant roots. The height of the plant presented differently according to the Fertigation management and sensitive to levels of electrical conductivity in the soil. The diameter of the roots showed reductions of 3.55 and 2.48 mm for C1 and C2, respectively, every unit increase in electrical conductivity (EC) to M1. Based on the functional relationship of the best adjustment between the diameter of the roots and electrical conductivity in M2 gave an estimated maximum diameter of 90.78 mm to 94.67 mm for C1 and C2.

Estado nutricional e produtividade de algodoeiro em função de diferentes espaçamentos e aplicação de regulador de crescimento

Strategies of cotton growth as row spacing and use of growth regulator are efficient when the knowledge of crop production potential as well as the amounts of nutrients content. The objective of this study was to evaluate the nutritional status of cotton DeltaOpal cultivar through leaf analysis of macronutrient, chlorophyll index and yield in relation to plant arrangement and managements of the growth regulator. The treatments consisted of plant arrangement: arrangement 1: 88,900 plant ha(-1) and row spacing at 0.9m, arrangement 2: 114,300 plant ha(-1) and row spacing at 0.7m, arrangement 3: 178,000 plant ha(-1) and row spacing at 0.45m; management of growth regulator (mepiquat chloride) at 1.0 L ha(-1) dose, concentration was50g L-1: a-no regulator application; b-single application at 70 days after emergency (d.a.e.); c-split application into four stages (35, 45, 55, and 65 d.a.e.). The reading reviews SPAD chlorophyll, leaf analysis of macronutrients and cotton yield were conducted in three agricultural years 2006/07, 2007/08 and 2008/09, under the experimental design of completely randomized blocks, in a 3x3 factorial scheme totaling up nine treatments with four replications. The reduction of row spacing and increasing plant density gives less absorption of potassium and sulfur by cotton crop. A single application of mepiquat chloride increase calcium leaf content. The split application of mepiquat chloride provides increased SPAD reading index, higher foliar magnesium concentration and highest seed cotton yield.

Comparação entre métodos para determinar o período anterior à interferência de plantas daninhas em feijoeiros com distintos tipos de hábitos de crescimento

Beans grain productivity may be reduced by up to 80% and, therefore, knowing the proper time to control weeds becomes fundamental, his research was conducted in order to determine the period prior to interference (PPI) on bean cultivars of different types'plant growth through distinct approaches: arbitrary level of 5% productivity loss; tolerance level (TL), and the Weed Period Prior to Economic Loss (WEEPPEL). Experimental treatments were constituted of ten periods of coexistence, periods of the crop with the weeds: 0-7; 0-14; 0-21; 0-28; 0-35; 0-42; 0-49; 0-56; 0-97 (harvesting) days after emergency (DAE), and a control plot, weed free for the entire period. The experimental design was of the Random Block Design, with four replications. PPI was obtained in all of the different approaches, and the bean plant type II with indeterminate growth had the lowest times of coexistence.

Avaliação da aplicação exógena de poliaminas no crescimento de calos de mangabeira (Hancornia speciosa Gomes)

Este trabalho teve como objetivo estudar o efeito das poliaminas espermidina e espermina no crescimento de calos Hancornia speciosa Gomes. Calos com 0,5 cm de diâmetro foram inoculados em meio Murashige & Skoog (1962) (MS) a 50% + 100 mg L-1 de caseína hidrolisada + 200 mg L-1 de levedura de cerveja, variando os tratamentos:A: 1 mmol de espermina + 2 mg L-1 de 2,4-D (ácido 2,4 diclorofenoxiacético) + 0,5 mg L-1 de NAA (ácido naftalenoacético); B: 1 mmol de espermidina + 2 mg L-1 de 2,4-D + 0,5 mg L-1 de NAA; C: 2 mg L-1 de 2,4-D + 0,5 mg L-1 de NAA. Não houve influência das poliaminas no crescimento dos calos. observou-se, nos calos tratados com espermidina, maior concentração celular de putrescina (582,37 µg g mf-1) aos 60 dias, maior teor de espermidina (502,54 µg g mf-1) e espermina (868,53 µg g mf-1) aos 40 dias de cultivo, quando se aplicou a própria poliamina. Conclui-se que a aplicação exógena de poliaminas em Hancornia speciosa não proporciona aumento no crescimento de calos. A oxidação promovida por longos períodos de cultivo in vitro induz aumento nos níveis de putrescina.

Influência do manganês no crescimento e na composição mineral de mudas de caramboleira

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

Crescimento e produtividade do algodoeiro em função da aplicação de subdoses de 2,4-d e cloreto de mepiquat

Pós-graduação em Agronomia - FEIS

Sistemas de aplicação de subdoses de glifosato e regulador de crescimento em algodoeiro

Pós-graduação em Agronomia - FEIS

Controle do crescimento e da seleção folicular por fatores locais e sistêmicos na espécie bovina

The regulation of ovarian activity is an integrated process involving extraovarian signals and intrafollicular factors. In such process, gonadotropins have an important role, but not always crucial. The initiation of primordial follicle growth and the early stages of folliculogenesis can occur without gonadotropins, however FSH may affect the rate of preantral follicle growth. On the other hand, the antral follicle development from 1 to 4 mm in diameter is completely gonadotropin-dependent in bovine, and the alternation of dependency from FSH to LH may be part of the mechanism involved in follicular selection. Locally produced growth factors, such as the IGF system, work in association with gonadotropins throughout the follicular growth and can influence follicular selection. Thus, the integration of these extraovarian signals and intrafollicular factors seems to determine whether a follicle will continue to develop or go atretic. This review focuses on the interaction between gonadotropins and intrafollicular factors in follicular development and selection in cattle.

Efeito do jejum sobre o desempenho zootécnico, crescimento e degradação muscular e alterações hepáticas de juvenis de pacu Piaractus mesopotamicus

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

Desempenho técnico e econômico de forrageiras tropicais em sistema integrado de produção no cerrado de baixa altitude

Pós-graduação em Agronomia - FEIS

Impactos do manejo de um sistema plantio direto no crescimento e produtividade do arroz de terras altas e feijão de inverno em sucessão e nos atributos do solo

Pós-graduação em Agronomia - FEIS

Crescimento, características nutricionais e fisiológicas de progênies de Eucalyptus grandis W. Hill. Ex Maiden sob diferentes doses de fósforo

Pós-graduação em Agronomia (Produção Vegetal) - FCAV

Silício e amônio na nutrição e no crescimento de brássicas

Pós-graduação em Agronomia (Produção Vegetal) - FCAV

Cultivo de Haematococcus pluvialis Flotow (Chlorophyceae) em sistema fototrófico e mixotrófico a base de meio alternativo

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)