Preliminary Studies on Nutritional Requirements of Chir (<I>Pinus roxburghii</I>)

Abstract

Sand culture experiment was conducted to study the nutritional requirements of chir (Pinus roxburghii) seedlings with respect to nitrogen, potassium and phosphorus. The results of the experiment have tentatively indicated that chir seedlings require higher levels of potassium about 400 Ibs. Per acre and lower levels of phosphorus and nitrogen about 200 lbs. per acre for good growth. However, with lower levels of potassium (200 lbs. per acre), nitrogen and phosphorus are required in more quantity (400 Ibs. Per acre) or at least one of the element nitrogen or phosphorus should be at higher level. With higher levels of potassium higher levels of both nitrogen and phosphorus retards the growth.