Abstract
ABSTRACT The effect of organic fertilization with cattle manure on fertility properties of soils with different clay contents was evaluated; as well as the influence of cattle manure fertilization on the production of lettuce, and on subsequent arugula and common chicory grown in these soils. The experiment with pot plants was arranged in randomized blocks and analyzed in a 3x6 factorial design with four replications. The treatments consisted of three soil types with different clay contents (166; 362; 565 g kg-1) and six cattle manure rates (0; 10; 20; 40; 80, and 160 t ha-1). Batches of each soil were manured, limed, filled in pots, moistened, and incubated for 30 days. Then, mineral base fertilization was applied and one lettuce seedling per each pot was grown. After lettuce harvest, the residual effect of organic fertilization was assessed in two subsequent crops, first arugula and then common chicory. The application of up to 160 t ha-1 cattle manure reduces soil acidity and increases nutrient contents, particularly of P, K and Zn, in soils with 165 to 565 g kg-1 clay content. Fertilization with cattle manure at rates of up to 160 t ha-1 increases electrical conductivity of soils, without affecting growth and yield of the leafy vegetables. Cattle manuring increases the yield of lettuce, as well as of arugula and common chicory grown afterwards.
Highlights
Leafy vegetables, as well as other vegetables, are considered nutrient-demanding because they require relatively large amounts in a relatively short period of time (GRANGEIRO et al, 2006)
We evaluated the effect of organic fertilization with cattle manure on fertility properties of soils with different clay contents and assessed the influence of cattle manuring on the production of crisphead lettuce as well as on the subsequent cultivation of arugula and common chicory
There was a significant interaction between the tested cattle manure rates and soil types for organic matter, pH, potential acidity and for the contents of P, Zn and SO42- S, indicating that the effect of organic fertilization on these properties depended on the soil type
Summary
As well as other vegetables, are considered nutrient-demanding because they require relatively large amounts in a relatively short period of time (GRANGEIRO et al, 2006). Very high rates may disturb the balance between nutrients and increase salt contents in the soil, which can hamper vegetable yields. This problem is usually greater in sandy soils, where organic fertilizers decompose faster and salt contents in the soil solution are higher (FIOREZE et al, 2012). Studies that evaluate the residual effect of organic fertilization on leafy vegetable cultivation in Brazil are scarce (PEIXOTO FILHO et al, 2013) In this context, we evaluated the effect of organic fertilization with cattle manure on fertility properties of soils with different clay contents and assessed the influence of cattle manuring on the production of crisphead lettuce as well as on the subsequent cultivation of arugula and common chicory
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