Lentil residue and nitrogen application effects on succeeding barley crop [effects of various lentil harvesting techniques, management of residues and type of preparatory tillage on the response of succeeding barley crop to nitrogen fertilizer application].
1989
Nanish N.M.A.
The experiment was initiated during lentil harvest June 1987 by comparing a hand harvest with harvests by double-knife mower and combine both with and without lentil stubble and residue grazing by sheep. The five methods comprised the main plot treatments, upon which deep tillage by sweep cultivator and chisel plow and shallow tillage by sweep cultivator alone were superimposed as subplots to incorporate lentil residue at different depths. Thereafter, barley was sown by Oyord plot drill and the split-split-plot arrangement was completed by two rates N fertilizer application (0 kg N/ha and a total of 60 kg N/ha in split application). Residual lentil N incorporated into the soil was the highest for combine harvest. The application of 60 kg N/ha increased barley biomass and grain yields by 2.9 and 1.2 t/ha, as compared to no N application. Concentration and total amount of N increased too in both grains and straw. The interaction of harvest method and fertilizer was significant only for number of grains/sub (m2) and the highest number was from hand and mower harvest; the same treatments showed the largest response to N fertilizer, while combine harvest showed the lowest response. Only the interaction of harvest method and tillage was significant for biomass, straw yield, straw N-yield, spikes/sub (m2), grains/sub (m2). Tillage, harvest method, tillage x N fertilizer, harvest method x tillage x N fertilizer interaction did not have significant effect on yield of barley. Total soil N content (measured before sowing of barley), mineral soil N content (measured after harvest) were not significantly affected by any of the experimental treatments and their interactions.
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