Dry-matter accumulation and nitrogen uptake in cumin (Cuminum cyminum) as affected by weed control and time of N application

Abstract

A field experiment was conductedduring of application of 30 kg Nlha (full basal, full the winter (rabi) season of 1991-92 at top-dressed 30 days after sowing and half Jobner (Rajasthan), to study the effect of basal + half at 30 days after sowing, repli- weed control and time of nitrogen applica- cated thrice in randomized block design. tion on weed biomass, dry-matter accumula- The soil was loamy sand with pH 8.5, or- tion of cumin (Cuminum cyminum L.), N ganic carbon 0.23%, available N 128 kglha, depletion by weeds and N uptake by crop. available P,O, 17 kgka and q O 147 kglha. The experiment comprised 6 weed-control Cumin cv. RZ 19 was sown in lines 30 cm treatments (weedy check, metolachlor @ 0.5 apart. Metolachlor and oxyfluorfen were ap- and 1.0 kglha, oxyfluorfen @ 0.15 and 0.30 plied as pre-emergence. Hand-weeding was kglha and hand-weeding twice) and 3 times done 20 and 50 days after sowing. Nitrogen