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Die waarde van petioolsap analise in die optimalisering van N-voeding by aartappels (Solanum tuberosum L.) in sandgronde
(Stellenbosch : Stellenbosch University, 2000-04)
ENGLISH ABSTRACT: Approximately 7000 ha of potatoes are cultivated under irrigation. The greatest part of the planting is entered under the South African Certification Scheme as seed potatoes, representing between 35 ...