Abstract
Seedlings of high quality are essential for the deployment of homogeneous plants. Thus, was evaluated the formation of seedlings of Jatropha ( Jatropha curcas L.) in different substrates fertilized with fertilizer-based lithothamnium. It was used substrates I) mixed of: never cultivated soil, cattle manure and sand in proportions: 3:1:1 volume/volume (v/v); II) commercial substrate Tropstrato ® ; III) cattle manure and carbonized rice straw in proportions: 1:1 (v/v); IV) birds manure, carbonized rice straw and never cultivated soil in proportions: 1:1:4, and V) fine vermiculite. Lithothamnium fertilizer levels used were 0%, 5% and 10% (v/v), respectively. The experimental design used was randomize blocks with factorial of 5x3 (five different substrates and three different lithothamnium doses) and four replication. Lithothamnium doses and substrates influenced the seedling growth of Jatropha. Seedlings fertilized with the substrates soil with mineral fertilizers (substrates 1); compost with manure and carbonized rice hulls (Substrate 3); soil with hatchery compost (Substrate 4) fertilized with a dose of 6.8% (v/v) lithothamnium showed the best result.
Highlights
The current economic development model refers to a future scenario of depletion of fossil fuels with serious threats to the standard of the current economic growth
This study aimed to evaluate the growth of seedlings of jatropha grown on substrates composed of raw materials obtainable associated with different fertilizer lithothamnium levels
The incorporation of lithothamnium to substrates composed of soil never cultivated, cattle manure and sand and cattle manure and carbonized rice straw, increased the percentage of plant emergence
Summary
The current economic development model refers to a future scenario of depletion of fossil fuels with serious threats to the standard of the current economic growth. Despite recent discoveries of new reserves, such as the pre-salt offshore Brazil, these tend to be insufficient in the face of growth rates of demand for fuel, besides the environmental risks of this type of deepwater exploration This fact, coupled with the political instability in the Middle East, which concentrates 78% of world oil reserves, has encouraged researchers to seek alternative sources of fuel, which can add to mitigate environmental impacts of fossil fuel combustion associated with concepts of sustainability, reducing hunger and poverty through employment generation and distribution income. With the probable demand, is necessary to spread Jatropha by vegetative means, and in this case, there is the production of seedlings from seeds in containers, justified by the low quality of seeds which has resulted large imbalance of farming. Physical characteristics are influenced by the substrate textural composition and chemical composition of the nutrient composition
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