Organic Lettuce Growth And Nutrient Uptake Response To Lime,Compost And Rock Phosphate |
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| Authors: | Luís Miguel Brito José Manuel Monteiro Isabel Mourão João Coutinho |
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| Institution: | 1. Instituto Politécnico de Viana do Castelo, Escola Superior Agrária, Ponte de Lima, Portugal;2. Mountain Research Center (CIMO), ESA - Instituto Politécnico de Bragan?a, Bragan?a, Portugalmiguelbrito@esa.ipvc.pt;4. Mountain Research Center (CIMO), ESA - Instituto Politécnico de Bragan?a, Bragan?a, Portugal;5. C Química, EC Vida e Ambiente, Universidade de Trás-os-Montes e Alto Douro, Vila Real, Portugal |
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| Abstract: | Fertilizer recommendations are needed to increase organic vegetable yields. Thus, organic lettuce growth and nutrient uptake was investigated in a randomized block pot experiment with twelve treatments from the factorial structure of three factors: (i) Gafsa phosphate 0 and 200 kg phosphorus pentoxide (P2O5) ha?1], (ii) compost from source separated municipal organic waste (0, 15, and 30 t ha?1) and (iii) limestone 0 and 8 t ha?1 calcium carbonate (CaCO3) equivalent]. Lettuce yield increased with compost application and a first order interaction between lime and phosphate was clear because lime partially replaced the need for phosphate. This was explained by the effect of liming on P availability in acid soils. Nitrogen (N), phosphorus (P), and potassium (K) accumulation increased in lettuces produced with compost or phosphate but only the accumulation of N was increased with lime. This compost is recommended to increase nutrient availability for organic lettuce whereas the need for phosphate fertilization may decrease with liming. |
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| Keywords: | compost fertilizers nitrogen nutrient uptake phosphorus |
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