Potential of ETE's domestic sludge as organic fertilization in crambe culture

Abstract

Crambe (Crambe abyssinica Hochst), belonging to the Brassicaceae family whose seeds contain about 35-60% of oil, appears as an option for the production of vegetable oil. Its precocity is the main advantage of the plant, which blooms at 35 days and can be harvested at 90 days after emergence, reaching average productivity of 1000 - 1800 kg ha^-1. This work evaluated the development of crambe submitted to increasing doses of domestic sludge from TEE. The treatments consisted of: 0; 4; 8; 16 and 32 Mg ha^-1. Each experimental unit consisted of vessels containing 2 kg of soil, with four replicates. The soil used was the Dystrophic Yellow Red Latosol. Leaf number, plant height, dry matter of the plant biomass and determination of the nitrogen content in the total plant were evaluated. The results were submitted to analysis of variance (ANOVA), followed by the regression analysis according to the doses, using the statistical program SAEG. The results of growth analysis indicated that with increasing doses of domestic sludge the plant responded better in terms of height and number of leaves. For dry weight, the plant had a better development with a dose of 32 Mg ha^-1. In relation to the nitrogen content, the highest nitrogen content was observed with the 32 Mg ha^-1 dose.