Woburn irrigation, 1951–59 II. Results for grass

Abstract

A grass/clover ley (mainly S26 cocksfoot and S 100 white clover 3 years, 1951–53) and a pure grass stand (S 37 cocksfoot 6 years, 1954–59) on the same site had threefold replication of four irrigation treatments: O, unwatered control; C, kept near field capacity throughout; A and B, intermediate between O and C. All plots received the same basic P and K dressing, and half-plots got N dressings either as N1 and N2, or as N2 and N4, the nitrogen being applied in the spring and after every cut except the last at rates: N1 0·15; N2, 0·30; N4, 0·60 cwt. N/acre. Cuts were taken at about 3 or 4 week intervals in the summer, and yields expressed as dry matter.