บทคัดย่องานวิจัย

หมวดหมู่ : ฐานข้อมูลงานวิจัย

Determination of the fertiliser requirements of pear trees from tree performance, leaf analysis and fruit quality data.

Wooldridge, J.;

Plant nutrition - from genetic engineering to field practice: proceedings of the twelfth international plant nutrition colloquium, 21-26 Sep. 1993, Perth, Australia. Year: 1993 Pages: 591-594 Ref: 6 ref.

1993

บทคัดย่อ

Determination of the fertiliser requirements of pear trees from tree performance, leaf analysis and fruit quality data.

A 9-year factorial field trial was carried out on an acid ultisol to determine the effects of lime, K and N application on pear (cv. [Williams'] Bon Chretien) tree performance and fruit quality. Liming soil to increase the pH from 4.4 to 5.5 or 6.0 increased leaf Ca content but reduced leaf K, Mn, B and Zn contents. Trunk circumference and yield were greatest at a soil pH of 5.5. Liming had no consistent effect on fruit composition or quality. Trunk circumferences in young trees increased over the range 50-150 mg Bray-2-extractable K/kg. In bearing trees, spring and postharvest KCl application between 60 and 180 kg/ha also increased trunk circumference and yield. High K application rates may have contributed to delayed fruit maturity. Bearing trees showed no significant response to N application rates between 60 and 180 kg limestone [calcium] ammonium nitrate (28% N)/ha applied in spring, 42 days after full bloom or postharvest. N was apparently in excess at these rates.