EFFECT OF NITROGEN, SILICON AND ORGANIC FERTILIZER MANAGEMENT ON GROWTH, YIELD AND LODGING OF TRADITIONAL AROMATIC RICE

Abstract

A field experiment was carried out at Experimental Field of Department of Agricultural Botany, Sher-e-Bangla Agricultural University (SAU), Dhaka to study he effect of nitrogen, silicon and organic fertilizer management on growth, yield and odging of traditional aromatic rice. The cultivars were grown during Boro season, 2019-20 (November, 2019 to May, 2020). The experiment consisted of two factors; Factor-A: three aromatic rice varieties viz. V 1 = Badshabhog, V = Chiniatab awnless) and V = Kataribhog (awnless) and Factor B: four levels of fertilizer management viz. T 3 1 = {30(BS) +20 (MT) + 10 (BPI)} kg ha -1 + no silicon and cowdung,

T 2 = {30(BS) +20 (MT) + 10 (BPI)} kg ha -1 + silicon (450 SiO ) + no cow-dung, T 3 = {30(BS) +20 (MT) + 10 (BPI)} kg ha -1 + No silicon + cow-dung (6 t ha -1 ) and T 4 = {30(BS) +20 (MT) + 10 (BPI)} kg ha -1 + silicon (450 SiO ) + cow-dung (6 t ha -1 ) (BS= basal dose; MT= mid-tillering and BPI= before panicle nitiation). The experiment was set up in two factors Randomized Complete Block Design (RCBD) with three replications. In case of varietal performance, V

Badshabhog) showed highest plant height, number of tillers hill -1 2 2 kg ha 2 -1 kg ha , leaf area index, 4

nternode diameter, culm height and culm dry weight, length and fresh weight of nternodes and chlorophyll content compared to V 2 (Chiniatab) and V (Kataribhog). The highest number of filled grains panicle -1 , grain weight hill -1 ,

ratio of spikelet number to LA and ratio of yield sink to LA were also achieved by V (Badshabhog) and this variety showed highest grain yield (2.52 t ha -1 ) which is 3.28% and 11% higher than V 2 (Chiniatab) and V 3 3 1 (Kataribhog), respectively. Similarly, variety V

Chiniatab) showed highest lodging resistance and aroma quality which was very close to the variety V 1 (Badshabhog) whereas V (Kataribhog) showed least performance. Again, in terms of fertilizer management practices, plant height, tiller number, leaf area, 4 th 3 internode diameter, culm height and dry weight, length and resh weight of internodes and chlorophyll content increased progressively with ncreasing fertilizers application and best result was achieved from T treatment compared to control treatment T 1 . The highest number of filled grains panicle , grain weight hill -1 ,

ratio of spikelet number to LA and ratio of yield sink to LA were also ound from T 4 treatment. This treatment (T ) also showed highest grain yield (2.76 t ha -1 4 ) with is 40.82% higher than control and 5.34% and 20% higher than T , espectively. The best performance of lodging resistance was performed by T ollowed by T but there was no significant effect of fertilizer management on aroma quality. In case of treatment combinations, V 2 1 T performed best in producing higher yield of rice (2.89 t ha -1 4 ) due to production of higher spikelets panicle , number of illed grains panicle -1 and grain weight hill -1 from V 1 T 4 whereas V showed the owest yield (1.86 t ha -1 ). Similarly, the treatment combination of V and V 2 T 4 showed strong lodging resistance and V 2 T 1 , V 2 T 2 , V 2 T 3 and V 2 T showed strong aroma quality of rice. These results suggested that fertilizer management plays a vital ole for improving stem strength in different rice cultivars. Regarding yield and odging resistance, firstly Badshabhog and next to Chiniatab and Kataribhog with SiO and cow-dung can be recommended. To obtain best aroma, Chiniatab can be ecommended with the same treatment. 2 3 -1 T 4 1 1 T 4 4 2 , V -1 -1 and T 2 T 2 1 th 2 3 4