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Mesosphaerum suaveolens (L.) Kuntze is a species of high phytotherapeutic and aromatic potential and quite widespread in Northeastern Brazil. However, the scarcity of good quality water and the high content of salts contained in the soil and irrigation water of the semi-arid region can compromise the crop growth and yield . Therefore, this study aimed to evaluate the effect of seed treatment with salicylic acid on the growth rates and the fluorescence indexes of chlorophyll ‘a’ from M. suaveolens plants irrigated with saline waters. The experiment was conducted in a randomized complete block design with a 5 x 5 incomplete factorial design, with five electrical conductivities of the irrigation water (ECw = 0.5, 1.45, 5.00, 8.55 and 10.0 dS m-1) and five salicylic acid doses (SA = 0.0, 0.29, 1.0, 1.71 and 2.0 mM L-1), generated by the Box Central Compound matrix. The evaluated variables were the absolute and relative growth rates for stem height and diameter and the indexes of fluorescence and quantum yield of photosystem II. The salinity of the water reduces the growth and the fluorescence indexes of the plants. The seeds treatment with salicylic acid at the doses of 1.99 and 0.69 mM L-1 attenuates the damaging effect from saline stress on the absolute and relative growths for the stem diameter.

The supply of organic matter in soils cultivated with vegetables is essential for satisfactory performance and economically viable, including the watermelon. This experiment aimed to evaluate the contents of N, P, K, Ca, Mg and S in watermelon plants grown in soil subjected to different levels of cattle manure. A complete randomized block design was adopted with four repetitions and 21 plants per parcel, using factorial arrangement 5 + 1 referring to five cattle manure levels (0.0, 11.5, 34.5, 57.5 and 80.5 g dm-3) in soil fertilized with nitrogen, in the form of urea, and one additional treatment (without N fertilizer and manure). To assess the nutritional status watermelon plants in the early fruiting, 25 leave (5 th leaf from the branch tip, excluding the apical tuft) per parcel to form a composite sample. Were evaluated: nitrogen, phosphorus, potassium, calcium, magnesium and sulfur in dry matter leaf. The supply of cattle manure increases the N, P, K e Ca absorption in watermelon plants. The highest levels of N, P and K were accumulated with providing cattle manure levels between 40 and 50 g dm-3.

Resumen pt: Um experimento foi conduzido em abrigo telado do Departamento de Solos do Centro CCA – UFPB, Areia, PB, no periodo de maio a junho de 2008, com o objetiv...

The experiment was carried out in the Remigio County, Paraiba State, Brazil, in order to evaluate the effects of bovine biofertilizer applied to soil in liqu...

Resumen pt: Um experimento de campo foi executado, no periodo de marco/2005 a fevereiro/2007, no municipio de Remigio, PB, para avaliar o efeito do biofertilizante s...

Resumen pt: Um experimento foi realizado no periodo de dezembro de 2008 a fevereiro de 2009, para avaliar os efeitos da utilizacao de biofertilizante bovino na produ...

The objective of this work was to evaluate the fruit attributes of yellow passion fruit cultivated in lysimeters, irrigated with non saline and saline water,...

Resumen pt: O experimento foi conduzido no periodo de janeiro a marco de 2007 em abrigo telado do DSER/ CCA/UFPB, Areia - PB, com o objetivo de avaliar o crescimento...

This work was carried out in greenhouse conditions at the Center of Agricultural Sciences of the Federal University of Paraiba, located in Areia, State of Pa...

Determining the correct nutrient supply of cultivated plants is fundamental to obtain high yields, especially for guava, an important fruitcrop for Brazil wh...

Avaliaram-se, no periodo de novembro de 2002 a junho de 2003, os efeitos dos biofertilizantes comum e supermagro aplicados ao solo na forma liquida sobre o comportamento vegetativo e produtivo do maracujazeiro-amarelo ( Passiflora edulis f. flavicarpa Deg.). Os biofertilizantes foram aplicados aos 30, 60 e 90 dias apos o plantio, nos volumes de 0, 0.6, 1.2, 1.8 e 2.4 L planta -1 , correspondentes as doses 0, 25, 50, 75 e 100% de 15 L m -2 , a partir de misturas de cada biofertilizante em agua, na proporcao de 1:1. Os biofertilizantes comum e supermagro nao interferiram significativamente no numero de ramos produtivos, no periodo para a poda do broto terminal da haste principal e dos ramos laterais. O biofertilizante supermagro inibiu o diâmetro do caule, a massa media dos frutos e a produtividade do maracujazeiro-amarelo quando comparado com o biofertilizante comum.