Viability of polycultures of arugula-carrot-coriander fertilized with hairy woodrose under different population densities

ABSTRACT Polycultures from broadleaves with tuberoses are being used in vegetable crop production systems in the semiarid region of Potiguar. The challenge is to determine whether these systems are productively viable when fertilized with organic matter produced by spontaneous species of the Caatinga biome. The objective of this study was to evaluate the agro-economic performance of arugula (A), carrot (C), and coriander (Co) polycultures fertilized with hairy woodrose biomass incorporated into the soil under different population densities among the component crops. The experimental design was a randomized complete block with four replications, with the treatments arranged in a 4 × 4 factorial scheme, from the combination of four amounts of hairy woodrose biomass incorporated into the soil (7.5, 15.0, 22.5, and 30.0 t ha-1 on a dry matter basis), with four population densities (20A-50C-20Co%, 30A-50C-30Co%, 40A-50C-40Co%, and 50A-50C-50Co% of the recommended population in the single crop). The efficiency of polycultures was evaluated through indexes and agro-economic indicators. The most productive agro-economic performance was obtained with a biomass of 18.21 t ha-1 of hairy woodrose incorporated in the soil and a population density of 50A-50C-50Co%

Viability of polycultures of arugula-carrot-coriander fertilized with hairy woodrose under different population densities

<div><p>ABSTRACT Polycultures from broadleaves with tuberoses are being used in vegetable crop production systems in the semiarid region of Potiguar. The challenge is to determine whether these systems are productively viable when fertilized with organic matter produced by spontaneous species of the Caatinga biome. The objective of this study was to evaluate the agro-economic performance of arugula (A), carrot (C), and coriander (Co) polycultures fertilized with hairy woodrose biomass incorporated into the soil under different population densities among the component crops. The experimental design was a randomized complete block with four replications, with the treatments arranged in a 4 × 4 factorial scheme, from the combination of four amounts of hairy woodrose biomass incorporated into the soil (7.5, 15.0, 22.5, and 30.0 t ha-1 on a dry matter basis), with four population densities (20A-50C-20Co%, 30A-50C-30Co%, 40A-50C-40Co%, and 50A-50C-50Co% of the recommended population in the single crop). The efficiency of polycultures was evaluated through indexes and agro-economic indicators. The most productive agro-economic performance was obtained with a biomass of 18.21 t ha-1 of hairy woodrose incorporated in the soil and a population density of 50A-50C-50Co%.</p></div

Associação de densidades populacionais de cenoura e alface no desempenho agronômico da cenoura em cultivo consorciado em faixa Association of carrot and lettuce planting densities on carrot agronomic performance in strip-intercropping system

O experimento foi realizado de junho a setembro de 2003, em área experimental da ESAM, para avaliar associações de densidades populacionais de cenoura e alface no desempenho agronômico da cenoura em sistema consorciado em faixa. O delineamento experimental utilizado foi de blocos completos casualizados, em esquema fatorial 4 x 4 com cinco repetições. Os tratamentos foram resultantes da combinação de quatro populações de cenoura [100%; 80%; 60% e 40% população recomendada no cultivo solteiro (PRCS)] com quatro populações de alface (100%; 80%; 60% e 40% da PRCS). A PRCS da cenoura na região é de 500.000 plantas/ha e no cultivo da alface é de 250.000 plantas/ha. As cultivares de cenoura e alface plantadas, pertencentes aos grupos Brasília e Americana, foram, respectivamente, 'Brasília' e 'Tainá'. Na cenoura avaliou-se altura de plantas, massa seca da parte aérea e das raízes, produtividades total e comercial, e classificação de raízes. Não houve interação significativa entre as densidades populacionais da cenoura e de alface em qualquer uma das características avaliadas na cenoura. Não houve também efeito significativo do aumento dos níveis populacionais da alface em qualquer característica avaliada na cenoura. O aumento na densidade populacional da cenoura aumentou a altura de plantas da cenoura e diminui a massa seca da parte aérea e de raízes, e a percentagem de raízes classes longa e média, e refugo. O aumento na associação das densidades populacionais de cenoura e de alface aumentou a produtividade total e comercial da cenoura, além do aumento na percentagem de raízes classe curta.<br>An experiment was carried out from June to September 2003, in the field, in Mossoró, Rio Grande do Norte State, Brazil. Associations of carrot (cv. Brasília) and lettuce (cv. Tainá) planting densities on carrot agronomic performance in strip-intercropping system were evaluated. The experimental design was of randomized complete blocks in a 4 x 4 factorial scheme with five replications. The treatments of the factorial consisted of the combination of four carrot-planting densities [100%; 80%; 60% and 40% of the recommended sole crop density (RSCD)] with four lettuce-planting densities (100%; 80%; 60% and 40% of the RSCD). The recommended planting density for the sole crop in the region is of 500.000 plants/ha for carrot and 250.000 plants/ha for lettuce. From the carrot crop we evaluated the plant height, shoot and root dry mass, total and commercial yield and classification of roots. No significant interaction between carrot densities and lettuce densities for any assessed trait in carrot crop was obtained. Also, no significant effect of increase in lettuce density was observed for any carrot-assessed trait. Plant height increased as carrot planting density increased, whereas shoot and root dry mass, and percentage of long and mean, and refused roots decreased with increasing of carrot density. As the association of carrot and lettuce planting densities increased, the total and commercial yield and percentage of short roots increased