Effect of Drip Irrigation Levels on Yield of Lettuce under Polyhouse and Open Field Condition

Abstract

The main objectives of cultivation of vegetables in a polyhouse condition are, to protect the crop against biotic (pests, diseases and weeds) and abiotic (temperature and humidity light) stresses and to ensure round the year production of high value quality vegetables especially, during the off-season. In India, protected cultivation is a new phenomenon and is still in its initial stage (Rai et al., 2004; Singh and Asrey, 2005).