ศูนย์นวัตกรรมเทคโนโลยีหลังการเก็บเกี่ยว

Postharvest nitrogen and fruit quality in nashi.

Marsh, K. B.; Lallu, N.; Cassidy, D.;

Orchardist Year: 1998 Vol: 71 Issue: 5 Pages: 56-59 Ref: 4 ref.

1998

บทคัดย่อ

This report summarizes the results of trials in 1992-94 at Richmond, New Zealand, in which Hosui and Nijisseiki pears on Pyrus pyrifolia rootstocks were given 55 kg N/ha as a single application in spring or autumn, or as split doses (one third in spring + two thirds in autumn or two thirds in spring + one third in autumn). No significant effects on yield of Hosui were observed except in the first year of the trial when withholding the spring fertilizer application gave higher fruit yields. In Nijisseiki, a 15% increase in yield was consistently observed as fertilizer applications were moved to the postharvest period. Nijisseiki trees produced slightly higher yields than Hosui trees. Leaf N concentration was high in 1992 and 1993 (2.66 and 3.59% dry weight, respectively, for Nijisseiki), but decreased in 1994 (1.92% dry weight). Leaf Mg concentrations were also low, despite applications of dolomite (1 t/ha annually) and kieserite (0.1 t/ha annually). Incidence of flesh spot decay on fruits of Hos

ui was low (<1% of fruit in 1992-93, <7% in 1994), and while its incidence on fruits of Nijisseiki reached 30% in 1992 and 1994, symptoms were only slight. Postharvest N application slightly decreased the incidence of flesh spot decay in 1992, but had no effect in 1993. Internal browning of fruits was more prevalent in 1993 on plots not given postharvest N treatments. It is concluded that N application could successfully be moved into the postharvest period at Richmond, New Zealand.