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首页> 外文期刊>American-Eurasian Journal of Agricultural and Environmental Sciences >Seed Production, Germination, Emergence and Growth of Tithonia diversifolia (HEMSL) A. Gray as Influenced by Different Sowing Depths and Soil Types
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Seed Production, Germination, Emergence and Growth of Tithonia diversifolia (HEMSL) A. Gray as Influenced by Different Sowing Depths and Soil Types

机译：不同播种深度和土壤类型对厚实二氧化钛（HEMSL）A. Gray种子产量，萌发，出苗和生长的影响

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摘要

Seed production, germination, emergence and the influence of planting depths and soil types on growth of T. diversifolia were determined from the harvest made in 2013 fruiting season. Natural population of Tithonia diversifolia stands growing on a clay soil was used for the study. Number of capitulum heads per plant was in the range of 35-212 with each capitulum head carrying seeds in the range of 32-62. Depending on the size and number of capitulum heads number of seeds per plant ranged from 1120-13,144 with average of 897,342 seeds per square meter. The seeds were small and light in weight as indicated by 100-seed weight (0.51-0.72g) with 93% viability. The seedlings that emerged from soil showed greater growth efficiency and vigour compared to seedlings obtained from seeds plated in petri-dishes. The young seedlings emerged at all depths studied with seeds sown on soil surface having 76.76% germination, while those at the depth of 3.5 cm showing 5%. Growth parameters such as root length, shoot length, leaf area, leaves number and dry matter accumulation were increased significantly (p<0.005) with decreasing sowing depth. The plant grew in all types of soils investigated with maximum growth in loamy followed by clayey and sandy soil. The foregoing results could be used to account for the aggressive nature of this plant.
机译：根据2013年结果季的收成，确定了种子的产量，发芽率，出苗率以及种植深度和土壤类型对紫花苜蓿生长的影响。用于研究的是在粘土上生长的天然ththonia diversifolia种群。每株植物的头目头数量在35-212范围内，每个头目头携带种子的范围在32-62之间。根据头状花序的大小和头数，每株植物的种子数量在1120-13144之间，平均每平方米897342种子。种子小且重量轻，如100粒重（0.51-0.72g）所示，具有93％的活力。与从接种在培养皿中的种子获得的幼苗相比，从土壤中出现的幼苗显示出更高的生长效率和活力。研究的所有深度的幼苗均萌发，种子播种在土壤表面的种子发芽率为76.76％，而3.5 cm深度的种子则发芽率为5％。随着播种深度的减少，根长，枝条长，叶面积，叶数和干物质积累等生长参数显着增加（p <0.005）。该植物在所有类型的土壤中生长，其中壤土最大，其次是黏土和沙土。前述结果可用于解释该植物的侵略性。

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