Abstract: In order to find out a referential efficient summer maize planting process and increase its grain yield effectively,with a comparative analysis method the difference of population structure and yield formation between high-yield mode of summer maize production and farmers' practice was cleared in Hebei Province.The results indicated that compared with farmers' practice,the output of high-yield mode increased by 21.4%,which resulted from more than 82 000 ears per ha and nearly 350 g of 1000-grain weight.In high-yield mode,due to the higher ear height index of summer maize the risk of lodging increased.The leaf area index (LAI) at silking stage was above 6.3,total leaf area duration in the whole growing period was more than 3 million (m²·d)/ha in high-yield production mode,more than 75% of which was in post-anthesis.After silking,the leaf area duration increased by 38.4% compared with farmers' practice.In high-yield mode,the dry matter transferred from stem and leaf to grain was significantly higher than farmers' practice in which dry matter accumulated in stem and leaf because the active period of grain filling was shorter.In high-yield production mode,the dry matter of population was up to 24 296 kg/ha at harvest and the harvest index achieved 54.43%.In the demand of N,P,K,for each 100 kg grain production,in high-yield production mode was 1.93,1.19,1.85 kg,respectively.Compared with the farmers' practice,the demand of potassium and phosphorus relatively increased,while nitrogen demand decreased slightly in high-yield mode.

Key words: High-yield summer maize, Population structure, Yield formation, Hebei Province

CLC Number: 

• S513.01