STUDY ON GRAIN YIELD AND YIELD COMPONENTS OF WHEAT WHEN SOWN LATE

Abstract

A field experiment was conducted at Sher-e-Bangla Agricultural University, Dhaka during the period from November 2021 to March 2022 in Rabi season, to study on grain yield and yield components of wheat when sown late. The experiment consisted of two factors, and followed Randomized block design with three replications. Factor A. Wheat varieties (2) viz; V 1 : BARI Gom-32 and V : BARI Gom-33 and Factor B. Different sowing date (5) viz; S 1 : 1 st ii 2 sowing date : 28 th November, 2021, S

sowing date : 5 th December, 2021, S 3 : 3 rd sowing date : 15 th December, 2021, S

sowing date : 21 th December, 2021 and S 5 : 5 th sowing date : 28 th December, 2021. Experimental result showed that in case of different wheat varieties the lowest grain yield (3.96 t ha -1 ) was observed in V (BARI Gom-32) treatment. Whereas cultivating BARI Gom-33 (V 2 1 ) variety gave the highest spike length (10.63 cm), spikelets spike

(17.59), grains spike -1 (46.85), 1000 grains weight (43.51 g), grain yield (4.73 t ha ), straw yield (5.86 t ha -1 ), biological yield (10.59 t ha -1 ) and harvest index (44.66 %). Among different sowing dates, seeds sown on 28 th November (S treatment) recorded the highest spike length (10.46 cm), spikelets spike -1 1 (17.49), grains spike (52.89), 1000 grains weight (46.20 g), grain yield (4.66 t ha -1 -1 ), straw yield (5.69 t ha ), biological yield (10.35 t ha -1 ) and harvest index (45.01%). In case of combination treatment the V 2 S combination treatment gave the highest highest spike length (11.46 cm), spikelets spike 1 -1 (18.46), grains spike -1 (56.46), 1000 grains weight (47.35 g), grain yield (5.02 t ha -1 ), grain yield (6.07 t ha -1 ), biological yield (11.09 t ha ) harvest index (45.27 %) comparable to other combination treatments. Therefore considering above all facts, it may be concluded that BARI Gom-33 variety seed sown on 28

November (V 2 S ) seems promising for reduction of yield less of late sown wheat than compared to other combination treatment and planting wheat seeds later than 28 1

November should be discouraged as it reduces wheat yield in both varieties.