Interferência das plantas daninhas na nutrição e produtividade da cultura da berinjela cultivar 'Nápoli' com e sem tutoramento e desbrota

Pós-graduação em Agronomia (Produção Vegetal) - FCAV

Liming in Growing Mango Cultivar Keitt in Production

The tropical soil acidity is one of the main limiting factors for crop productivity. This study aimed to evaluate the effects of application of limestone dose to soil fertility, nutritional status of the crop, and productivity and quality of the fruits of mango, cultivar Keitt. The study was carried out at Selviria, state of Mato Grosso Sul, Brazil, in a Typic Haplustox (pH in CaCl2=4.7), cultivated with mango cultivar Keitt grafted on Coquinho pattern in the production phase (13years old). Treatments were composed of limestone doses (0, 1.55, 3.10, 4.65, and 6.20tha(-1)), arranged in blocks at random with three repetitions. The limestone was applied and incorporated in the surface layer of 0 to 5cm deep in the total area. We evaluated the chemical attributes of the soil [pH, hydrogen (H+) aluminum (Al), calcium (Ca), magnesium (Mg), potassium (K), and sum of bases and base saturation] at 16 and 28months after liming (layer 0 to 20cm deep), the nutrition of plants at 12months after liming, and quality of the fruit in two crop years. Liming promoted improvements in soil chemical attributes, reflected in the nutritional status, productivity, and quality of mango fruit. Also, there was a linear effect with the application of lime dose on the productivity of the fruit, but after the second year of evaluation.

Dris norms and critical leaf nutrient levels for ‘Niagara rosada’ grape in Jundiaí region, São Paulo (Brasil)

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Nutritional status of the cauliflower cultivar ‘verona’ grown with omission of out added macronutrients

Knowledge of plant nutritional status allows an understanding of the physiological responses of plants to crop fertilization. A hydroponic experiment evaluated the symptoms of macronutrient deficiency in cauliflower 'Verona'and determined: a) the macronutrient contents of foliar tissues when visual symptoms were observed, b) macronutrients content of foliar and inflorescence tissues at harvest. The effect of nutrient deficiency on inflorescence mass was also evaluated. Nitrogen deficiency caused chlorosis followed by purple color in the old leaves, while P deficiency caused only chlorosis in old leaves. Chlorosis at the edge of old leaves progressing to the center of the leaves was observed with the omission of K, and after was observed necrosis in the chlorotic areas. Ca deficiency caused tip burn in new leaves, while Mg deficiency caused internerval chlorosis in old leaves. The omission of eachmacronutrient reduced inflorescence dry matter. This deleterious effect was larger for N, P, and K deficiencies, reducing inflorescence dry matter by 87, 49, and 42%, respectively. When the nutrient solutions without N, P, K, Ca, or Mg were supplied to cauliflower plants, the macronutrient contents at harvest were 8.8, 0.6, 3.5, 13.0, and 0.8 g kg(-1) in the foliar tissues and 27.3, 2.2, 21.6, 1.1, and 0.7 g kg(-1) in the inflorescence tissues, respectively.

Benzilaminopurina e ácido naftaleno acético na indução e multiplicação in vitro de gemas de abacaxizeiro da cultivar 'IAC Gomo-de-mel'

O objetivo deste trabalho foi avaliar os efeitos de BAP (6-benzilaminopurina) e NAA (ácido naftaleno acético) na indução, na multiplicação in vitro de gemas, nas brotações de Ananas comosus da cultivar 'IAC Gomo-de-mel' e a correlação desses efeitos com a atividade de peroxidase e o teor de proteína solúvel total. Foram utilizadas gemas axilares retiradas da coroa de frutos sadios, inoculadas em tubo de ensaio contendo meio de cultura MS solidificado com ágar a 5%, pH ajustado para 5,7, contendo os tratamentos que incluíam diferentes concentrações e combinações de BAP (0, 0,5, 1,0 e 1,5mg L-1) e NAA (0, 0,5 e 1,0mg L-1). Nessa fase, aos 65 dias, ocorreu a formação de 2,24 brotações, utilizando-se 1mg L-1 de BAP. Após o desenvolvimento, as gemas foram inoculadas em meio MS líquido associado a dois tratamentos (1,0mg L-1 BAP + 0,5mg L-1 NAA e 1,0mg L-1 BAP + 1,0mg L-1 NAA) e, aos 95 dias, o meio de cultura mais adequado foi aquele que continha 1,0mg L-1 BAP + 0,5mg L-1 NAA, proporcionando 7,42 brotações, menor porcentagem de hiper-hidricidade, maior número de brotações e indução de gemas. As proteínas solúveis apresentaram relação negativa com hiper-hidricidade e comprimento de brotações. A atividade da peroxidase foi maior em plantas com maior número de brotos e com maior porcentagem de hiper-hidricidade.

Growth and flowering of five mango cultivar under subtropics conditions of Brazil

The evaluation of the new cultivars adaptation and yield potential of Mangifera indica L. provides tools to assist and improve the mango production in different climates conditions. This study aimed to evaluate the phenological and reproductive development of five mango cultivars (Bourbon, Haden, Palmer, Parwin and Tommy Atkins), on climate conditions in dry land and four production cycles (from 08/2007 to 01/2011), at São Manuel, São Paulo state, Brazil. The variables were total plant height, trunk height, stem diameter and the first insertion diameter, fruits physical characteristics, yield and harvest period, flowering seasonality and morphological characterization of the inflorescences. It was found that the four-year-old plants of Haden cv. reach 4.0 m high and 0.20 m of trunk diameter. Bourbon cultivar had the highest flowering period, from April to October. Tommy Atkins cv. had productivities of 14779.07 kg∙ha−1 in the fourth cycle and the productivity of Bourbon, Haden and Palmer cultivars was alternated.

Fenologia e efeito da desfolha parcial na produção extemporânea de efeito da desfolha parcial na produção extemporânea da videira, cultivar Cabernet Franc (Vitis vinifera L.), na região de São Roque - SP

Pós-graduação em Agronomia (Horticultura) - FCA