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Record number 1209524
Article title Water and mineral balances of organically grown vegetables under glass
Author(s) Voogt, W.
Journal title Acta horticulturae : technical communications of I.S.H.S. / International Society for Horticultural Science
Part(Year)Number 506(1999)
Pages 51 - 57
Notes Ill.; Tab.; Summary; 14 refs
Online May be available online via journal: Acta horticulturae : technical communications of I.S.H.S. / International Society for Horticultural ScienceTransactions / International Society of Horticultural Science
Keyword(s) protected cultivation / organic fertilizers / vegetables / greenhouse horticulture
Categories x
Language English
About (Dutch) Water and mineral inputs and outputs were observed for two years at five glasshouse holdings with organically grown vegetables. Large differences in the quantity of water irrigated were found between the holdings that did not coincide with estimations of evapotranspiration. At two holdings the estimated leaching of nutrients was high and large differences were found in mineral content of organic fertilizers. At two other holdings with sandy soils, high NO3 concentrations were found in the soil solution 100 cm below the soil surface, resulting in an estimated loss of 40 and 470 kg N ha-1 yr-1 respectively. However, at a further two holdings with clay soils and high ground water levels, NO3 levels were low resulting in an estimated leaching of below 10 kg N ha-1 yr-1. Irrespective of the P-buffer in the soil, the P input exceeded the legislative quantity by up to two- to five-fold
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