Abstract Waste generated from agribusiness, such as swine production, can be used in agricultural soil; however, certain technical criteria should be followed. The objective of this study was to evaluate the effects of different depths of irrigation with swine wastewater (SW), associated with the soil management system, on soil chemical attributes after two corn crop cycles. The experiments were conducted in the field, in an arrangement with two soil management systems (conventional tillage system – CTS and no-tillage system – NTS) and five depths of irrigation with SW (50%, 75%, 100%, 125% and 150% of evapotranspiration from the crop – ETc). Soil samples were collected at depths of 0–0.1 and 0.1–0.2 m to determine the pH, Ca, Mg, K, Na, Al, P, Fe, Cu and Zn at the end of each crop cycle. Soil nutrient contents increased with the application of SW irrigation in the two crop cycles and in the depths of 0–0.1 and 0.1–0.2 m, mainly with an increase of irrigation depths. No effect of the management systems was observed for the majority of the nutrients evaluated. The content of the heavy metals Cu and Zn remained below the critical limits established by the Brazilian Regulations.

RESUMO O objetivo do presente trabalho foi avaliar a massa fresca do jiló (kg/pl) e número de folhas de almeirão (nºf/pl) em função dos espaçamentos usuais pelos agricultures da região para ambas as culturas em sistema consorciado variando o número de linhas de almeirão na entrelinha do jiló e, colheitas (ciclo de cada cultura), para os consórcios e monocultivos. Os tratamentos foram T1= jiló 0,7x1,1 m (monocultivo); T2= consórcio de jiló, espaçamento de 0,7x1,5 m, com quatro filas de almeirão, 0,2x0,2 m, nas entrelinhas; T3= consórcio de jiló, 0,7x1,1 m, com três filas e almeirão, 0,2x0,2 m; T4= consórcio de jiló, 0,7x1,3 m, com quatro filas de almeirão, 0,2x0,2 m; T5= consórcio de jiló, 0,7x1,3 m, com três filas de almeirão, 0,2x0,2 m; T6= almeirão 0,2x0,1x0,4 m em duas filas duplas com 0,2 m entre linhas, 0,1 m entre plantas e 0,4 m entre filas duplas sobre 1,5 m linear de área (monocultivo) e T7= almeirão 0,2x0,3 m com três filas simples sobre 1,5 m de área (monocultivo). O delineamento foi em faixa, em um fatorial 5x16, contendo cinco espaçamentos de jiló de forma isolada, sendo 1,5x0,7 m, 1,3x0,7 m e 1,1x0,7 m, alternando-se o número de linhas de almeirão na entrelinha e 16 colheitas no tempo, sendo realizada uma por semana. Para o almeirão, o delineamento também foi em faixa em um fatorial 6x12, com seis espaçamentos. O espaçamento de 0,2x0,2 m foi consorciado com jiló, alternando-se o número de linhas e dois monocultivos 0,2x0,1x0,4 m em filas duplas e 0,2x0,3 m com 12 colheitas no tempo, sendo realizada uma por semana juntamente com o jiló. O jiló em consórcio no espaçamento de 0,7x1,5 m apresentou maiores médias em algumas colheitas seguido do espaçamento de 0,7x1,3 m com quatro filas de almeirão na entrelinha. Os espaçamentos 0,2x0,1x0,4 m e 0,2x0,3 m foram os que proporcionaram as melhores médias para a cultura do almeirão, com exceção para a 5° colheita, em que o espaçamento 0,2x0,2 m com quatro filas de almeirão proporcionou a maior média (5.7 folhas/planta). Independente do monocultivo e arranjo de consórcio utilizado para almeirão o IEA foi superior a 1.6.

ABSTRACT The aim of this study was to evaluate the fresh mass of scarlet eggplant (kg/pl) and the number of leaves of chicory (nºf/pl) in relation to the spacing used by the farmers of the region for both crops. The experiment evaluated these crops under intercropping cultivation system, varying the number of chicory rows between scarlet eggplant rows as well as harvests (cycle of each crop), for intercropping and monocropping systems. The treatments were T1= scarlet eggplant 0.7x1.1 m (monocropping); T2= intercropped scarlet eggplant, 0.7x1.5 m, with four rows of chicory, 0.2x0.2 m between rows; T3= intercropped scarlet eggplant, 0.7x1.1 m, with three rows and chicory, 0.2x0.2 m; T4= intercropped scarlet eggplant, 0.7x1.3 m, with four rows of chicory, 0.2x0.2 m; T5= intercropped scarlet eggplant, 0.7x1.3 m, with three rows of chicory, 0.2x0.2 m; T6= chicory 0.2x0.1x0.4 m in two double rows, 0.2 m between rows, 0.1 m between plants and 0.4 m between double rows in 1.5 m linear area (monocropping) and T7= chicory 0.2x0.3 m with three simple rows in an 1.5-m area (monocropping). The experimental design was of strip blocks, in a 5x16 factorial scheme, consisting of five spacings of scarlet eggplant (monocropping), 1.5x0.7 m, 1.3x0.7 m and 1.1x0.7 m, alternating the number of chicory rows between rows and 16 harvests in time, once a week. For chicory, the design was also in a 6x12 factorial scheme, with six spacings. The spacing 0.2x0.2 m was intercropped with scarlet eggplant, alternating the number of rows and two monocroppings 0.2x0.1x0.4 m in double rows and 0.2x0.3 m with 12 harvests in time, being performed one harvest per week along with the scarlet eggplant. Intercropped scarlet eggplant in spacing 0.7x1.5 m showed higher averages in some harvests followed by spacing 0.7x1.3 m with four chicory rows between rows. Spacings 0.2x0.1x0.4 m and 0.2x0.3 m were the ones which provided the best averages for chicory crop, except for the 5th harvest, in which spacing 0.2x0.2 m consisting of four chicory rows provided the highest average (5.7 leaves/plant). Regardless of monocropping and intercropping arrangement used for chicory the Area Equivalence Index (IEA) was over 1.6.