Abstract
Organic white cabbage response to the application of a source-separated municipal organic-waste compost, lime, and Gafsa phosphate was investigated throughout a randomized block pot experiment under greenhouse conditions. Cabbage yield and nitrogen (N) uptake increased with all fertilizes; however, lime and phosphate effects on cabbage yield were enhanced when the compost was not applied. Phosphate application partially replaced the need for lime, showing that liming has to be estimated based on soil acidity but also on soil P availability and phosphate recommendation. Partitioning of N, phosphorus (P), potassium (K), and calcium (Ca) between leaves and roots was held for the benefit of the leaves, but to a lesser extent for P and Ca, compared to for N and K. This study shows the importance of P availability to improve cabbage growth and recommends source-separated organic waste compost to increase soil N availability for organic cabbage.
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