Nitrogen requirements of Nashi (Pyrus pyrifolia Rehder.) under New Zealand conditions: A thesis submitted in partial fulfilment of the requirements for the degree of Masters in Agricultural Science at Lincoln University

Abstract

Field and pot trial studies on the effects of applied nitrogen (N) on nashi (Pyrus pyrifolia Rehder.) growth at Lincoln University and a commercial orchard in Prebbleton, Canterbury, New Zealand (N.Z) were conducted between January 1993 to November 1994. The cultivar 'Hosui' (P. pyrifolia on P. calleryana rootstock) was used in this study. The objectives of the study were to determine the effects of applied N on growth and estimate N levels necessary to maintain nashi tree vigour, growth and yield under N.Z conditions.