Cumulative dressings of potassium metaphosphate and soluble PK-fertilizers for seedlings and transplants ofPicea sitchensis in two English nurseries

Abstract

Cumulative dressings of potassium metaphosphate tested on seedlings and transplants ofPicea sitchensis gave promising results from 1964 to 19661 at two nurseries — a sandy podsol and a sandy loam with better nutrient retention. The four experiments, which also included superphosphate alone, KC1/superphosphate, with and without topdressings of KNO3, and potassium dihydrogen phosphate, were continued until 1969. On the podsol, potassium metaphosphate maintained its superiority for seedlings and also left larger residues in the surface soil. It had no special merit on the sandy loam or for transplants on either soil.