P. radiata grafts were fertilized with ammonium sulphate, ammonium nitrate, sodium nitrate and urea to the soil in the field and arginine solution was applied to the soil or foliage of potted grafts in a glasshouse in order to increase arginine conten...
P. radiata grafts were fertilized with ammonium sulphate, ammonium nitrate, sodium nitrate and urea to the soil in the field and arginine solution was applied to the soil or foliage of potted grafts in a glasshouse in order to increase arginine content in buds. Following results were obtained.
1. Of the nitrogen sources tested in the field urea was the most effective: its treatment significantiy increased the level of arginine in buds of some clones.
2. Ammonium sulphate, ammonium nitrate and sodium nitrate did not result in a consistent increase in arginine content of the bud tissue, The effect varied with the clone tested.
3. Soil-watering with an arginine solution increased several-fold the levels of arginine in the buds.