Chemical-nutritional composition of maniçoba (Manihot sp.) and its relationship with soil chemical characteristics

Abstract

-The objective of this study was to evaluate the chemical composition of leaves of maniçoba (Manihot sp.) according to their development stage and their relationship with the soil characteristics. For this purpose, plants in their natural growth areas in the semiarid region of Paraíba State, Brazil, were sampled. Leaves of maniçoba collected in five different locations at four different development stages were harvested and characterized: expanding leaf, completely expanded leaf, leaf at the beginning of senescence and a pool (mixture of all leaves). The evaluated traits were: dry matter, crude protein, neutral detergent fiber, acid detergent fiber, neutral detergent insoluble protein, acid detergent insoluble protein, ash, lignin, cellulose, hemicellulose, nitrogen, potassium, phosphorus, sulfur and sodium. The experimental design adopted was completely randomized, in a 4 × 5 factorial arrangement: four leaf development stages and five locations, respectively; each plot had 10 replications. There was interaction effect between leaf development stage and locations on dry matter, crude protein, neutral detergent insoluble protein and acid detergent insoluble protein. The results for neutral detergent fiber of leaves at the beginning of senescence were higher than other treatments and similar to the pool, while the acid detergent fiber content of the leaves in early senescence was higher than those of other treatments, averaging 34.8%. Crude protein content had its highest percentage in expanding leaves, averaging 23.0%. Nitrogen, potassium and sodium data showed interaction between the leaf types and locations of harvest, while phosphorus and sulfur did not show interaction. The chemical and mineral composition of maniçoba leaves range according to their development phase and according to their soil and climatic conditions in places of natural occurrence, with a tendency towards reduction of nitrogen and phosphorus as they approach senescence.

Maniçoba for sheep and goats - forage yield, conservation strategies, animal performance and quality of products

“…presented 148.0; 124.0; 175.0; and 115.0 g kg -1 CP and 604.0, 679.0, 510.0 and 683.0 g kg -1 NdF, respectively. The nutritional value of maniçoba is influenced by divers factors, such as chemical fertilization, soil types and management, plant cutting height and stage of development of the plant (ANdRAdE et al, 2014;MOREIRA FILHO et al, 2009). In a study carried out by PARENTE et al (2007), maniçoba in natura showed 13.91% CP when supplied with 100 kg N ha -1 , while without nitrogen fertilization the CP content was 8.58%, According to MENEZES et al ( 2012), the potential dM degradability of maniçoba hay was 70%, while the effective degradability (5%/h) was 57.4%.…”

“…Nitrogen and potassium presented the greatest contents, followed by calcium and magnesium. According to ANdRAdE et al (2014), N and K levels of maniçoba are influenced by the stage of leaf development and the plant location. They observed N and K differences in the leaves at the beginning of the senescence process compared with expanding or completely expanded leaves, attributed to the nutrient translocation, especially N from old to new leaves.…”