Abstract:

To determine the suitable sowing date and amount of winter wheat ‘Linyuan8’, the split plot design was used in this study. The number of wheat population at different developmental stages was determined by fixing 1 m uniform growth section in each plot. Thirty ears were selected from each plot at maturity, and the panicle length, the number of grains per panicle and the number of fruiting spikelets were detected. After drying grains, 1000-grain weight and grain yield were measured. The results showed that: (1)the population traits of wheat decreased with the delay of sowing date, and the total stem number increased with the increase of sowing amount; (2)with the delay of sowing date, the number of grains per panicle and 1000-grain weight increased first and then decreased, with the increase of sowing amount, the number of grains per panicle and 1000-grain weight decreased gradually; (3)with the delay of sowing date and the increase of sowing amount, the grain yield first increased and then decreased; the highest yield of 8722.58 kg/hm ²was achieved at the sowing amount of 300×10 ⁴ grains/hm ² on the sowing date of October 5, followed by the yield of 8678.25 kg/hm ²achieved at the sowing amount of 375×10 ⁴ grains/hm ² on the sowing date of October 12. Thus, the sowing date is the main factor causing the change of wheat yield and yield structure, the best sowing date of 'Linyuan8' is from October 5 to 12, and the sowing amount is 300×10 ⁴ grains/hm ² to 375×10 ⁴ grains/hm ².

Key words: winter wheat, Linyuan8, sowing date and amount, population traits, yield