PJB-2019-494
Growth, yield and biochemical responses in barley to DAP and chitosan application under water stress
Abdel Rahman M. Al- Tawaha
Abstract
The present investigation was aimed to enhance quality and productivity of barley by fertilizer and chitosan application. Field experiments were conducted in northern region of Jordan, under rain fed conditions in the main growing seasons of 2014/2015 and 2015/2016. The experiment was prepared in the form of split-plot with three replications and two fertilizer levels (0 and 100 kg/ ha DAP (Diammonium phosphate 46% P2O5) were randomly allocated to the main plots in each replicate. Three levels (0, 5, and 10 g/L) of chitosan were randomly used before each fertilizer plot as subplot treatments. The results revealed the highest seed dry weight (5.8 g per plant) with the application of 100 kg ha-1 of DAP while the lowest (5.2 g per plant) was recorded in the control which exhibited an increase of about 10 %. However, the grain yield per plant, number of spikes per plant, number of grains per spike was notably affected by chitosan application. There were also highly significant differences (P<0.01) among lines with and without chitosan treatment. The highest grain yield per plant and number of spikes per plant and grains per spike were obtained with the foliar application of 10g/L chitosan to barley plants at tillering stage. Similarly, grain quality, particularly with respect to protein and starch, was found to be enhanced significantly over control. The highest protein (12.6 %) and starch (62.3 %) were obtained with 100 kg/ha DAP fertilizer level mixed with 10g/L chitosan. Therefore, based on findings, it can be concluded that the fertilizer level 100 kg/ha DAP combined with 10g/L chitosan is economically best and recommendable for improving quality and productivity of barley in northern region of Jordan. Key words: Barley, DAP, chitosan, fertilizer, Jordan.
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