The effect of KCl, KNO3, and CaCl2 fertilization under conventional- and zero-till systems on common root rot, dry matter yield and grain yield of Heartland barley.
Field studies were conducted in Manitoba in 1987-90 on sandy loam and silty clay soils testing low in Cl to assess the influence of K (0-100 kg K/ha) and Cl (0-90 kg Cl/ha) fertilizers under zero (ZT) and conventional tillage (CT) management on common root rot (Cochliobolus sativus), DM yield at heading, and grain yield of barley cv. Heartland. Tillage did not influence incidence of common root rot in the 4 site-years where assessments could be taken. Common root rot incidence was reduced by KCl applications in 1 out of 4 site-years. DM yield at heading and grain yields were consistently higher with ZT than with CT on the silty clay soil, but only in 1988 on the fine sandy loam soil. The higher yields with ZT than with CT may be due to greater moisture conservation under the ZT management system. Response to K or Cl applications was generally not influenced by tillage treatment. Applications of Cl had little influence on either DM yield at heading or grain yield, despite the low initial Cl levels in the soils. Application of fertilizers containing Cl, therefore, may not be consistently beneficial, even on soils testing low in Cl.