Use of compost from grape pomace as organic amendment for recoverying a decayed pear (Pyrus communis cv Packam’s Triumph) ORCHARD

During two growing seasons, an experiment was performed to evaluate the effects of mature compost from grape pomace on the recovery of a pear (Pyrus communis L.) orchard. Two treatments (T1: control, T2: Integrated plant nutrition, IPN) were compared. The IPN consisted on the application of 20 ton/ha of compost, together with chemical fertilization of 70 kg N/ha, 20 kg P2O5/ha and 66 kg K2O/ha; the control treatment included only chemical fertilization.

Applied compost had, C/N ratio 11:1, pH 7.82, EC 0.86 dS/m, N-NH4/N-NO3 ratio 0.81, Olsen-P 448 ppm, extractable K 43.20 cmol/Kg, Salmonella sp., and E. coli < L.D. and a low content of trace elements, with the exemption of Cu. Compost was applied in band, in winter time, while chemical fertilization was applied during the growing season. Evaluations included: total shoot growth, root density, pruning weight, enzymatic activity in soil, nutrient leaf contents, physical and chemical soil properties, Normalized Difference Vegetation Index (NDVI), and SPAD readings. Nutrient indices were calculated by multiplying NDVI by total nutrient content.

Results showed significant differences (p<0.05) between treatments for root density, pruning weight, enzymatic activity in soil, NDVI, SPAD, Na, Zn, Cu leaf contents and nutrient indices for N, K, Ca, Mg, Cu and Zn, soil bulk density, porosity organic matter content, and for Olsen-P, extractable K, Mn, and B in soil, which were larger for IPN.

Integrated plant nutrition seems to be the way to recover decayed orchards through the inclusion of good quality organic matter within the management program.



Copyright: © European Compost Network ECN e.V.
Source: Orbit 2014 (Juni 2014)
Pages: 0
Price: € 0,00
Autor: Hugo Poblete
Maria M. Martinez
Rodrigo Ortega

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