Effect of sulphur in conjunction with growth substances on productivity of clusterbean (Cyamopsis tetragonoloba) and their residual effect on barley (Hordeum vulgare)

Abstract

A field study was carried out during 2000-01 and 2001-02 to assess the effect of levels and sources of sul- phur along with growth substances on clusterbean [Cyamopsis tetragonoloba (L.) Taub] as well as their residual effect on succeeding barley (Hordeum vulgare L. s.1.) crop was undertaken at ARS, Fatehpur-Shekhawati. The treatments consisted combinations of 3 levels of S (0, 25 and 50 kglha), 2 sources of S (Gypsum and SulFer 95) and 3 growth substances (thiourea, DMSO and brassinolids). Sulphur fertilization up to 50 kglha significantly in- creased podslplant, grainslplant, test weight and subsequently increased yield of clusterbean. Application of sul- phur through SulFer 95 was found superior to gypsum for improvement in yield attributes and yield of clusterbean. Significant variation among foliar-applied growth substances was observed for yield attributes and yield of clusterbean. Thiourea recorded the maximum grain yield followed by brassinolids and DMSO. Residual studies revealed that application of S at 25 kglha was optimum for single crop of clusterbean, while for clusterbean-barley crop sequence higher level of S, i.e. 50 kglha was found effective. SulFer 95 as a source of S was found superior to gypsum in increasing grain yield of succeeding crop of barley.