Abstract:

The study aims to explore the high and stable yield characteristics, growth dynamics and reasonable high yield population structure of ‘Mintian 6855’, so as to provide a scientific basis for the supporting cultivation. The experimental and demonstration output data from 2011 to 2019 were collected to analyze the high and stable yield of the variety. The agronomic characters and growth dynamics of the variety were analyzed based on the multi-year test data, and the density test was mainly designed to screen the suitable planting density of the variety. The high-yield character of ‘Mintian 6855’ was closely related to the growth and development dynamics of excellent agronomic characters, early growth and rapid development. Considering the plant type characteristics and the marketability of panicle, the suitable planting density of ‘Mintian 6855’ ranged from 45000 plants/hm ²to 48750 plants/hm², and the light transmittance of panicle layer and ground was 37.3%-43.8% and 10.6%-13.1% respectively from silking to filling stage, LAI reached 4.68 at silking stage, and still remained above 4.20 at filling stage. The LAD was 131.5 and kept increasing steadily. NAR was 8.27 at filling stage. The key measures for high-yield cultivation of ‘Mintian 6855’ are to select suitable planting density and effectively regulate photosynthetic indexes in different growth periods.

Key words: Mintian6855, planting density, agronomic characters, population structure