Dry sewage sludge application and mineral fertilization in Pinus caribaea var. hondurensis plantations: productivity and nutrient balance

作者：Ferraz Alexandre de Vicente^*; Poggiani Fabio; Mueller da Silva Paulo Henrique

来源：Forest Sciences, 2016, 44(112): 959-970.

DOI：10.18671/scifor.v44n112.17

• Dry biosolids
• Export of nutrients
• Organic fertilization
• Nutrient balance

The sewage sludge application in forest plantations allows recycling of organic matter and nutrients, between urban and agroforestry environments, and may contribute to lower consumption of mineral fertilizers. The aim of this study was to evaluate the growth and woody biomass production in Pinus caribaea var. hondurensis plantations as well as the nutrients export through wood harvesting (stemwood + stembark) nine years after planting, in response to dry sewage sludge application and mineral fertilization. It was also estimated the "nutrient balance" through the difference between nutrients added with fertilization and the nutrients exported with the wood harvest. The experimental design was a randomized block with four replications and four treatments: 1) Control, without any fertilization (C); 2) Mineral Fertilization (FM); 3) Fertilization with 18 t ha((dry basis))(-1) of sewage sludge, without mineral fertilizers additional (LSF) and 4) Fertilization with 18 t ha(-1) ((dry basis)) of sewage sludge complemented with mineral fertilizers (LCF). Until the six years old, trees fertilized with sludge (LSF and LCF) had the greatest diameter at breast height (DBH) and height of the trunk (7 to 12%), which resulted in higher wood volume (about 20%) in relation to trees in C and FM treatments. At nine years old, the volume and stem biomass were similar among treatments. In general, the nutrients export through the trunk harvest was higher in LCF treatment; even so the nutrients balance in sludge treatments was positive and higher than C and FM treatments, especially for the N, P, Ca, S and Zn elements.

• 出版日期2016-12