芝麻干物质积累和需肥规律的研究

The Dry Matter Accumulation and the Uptake of Nitrogen Phosphorus and Potassium by Summer Sowing Sesame

夏播芝麻在每hm^21755kg产量水平下,每生产100kg籽粒,需要N6.76kg,P_2O_52.31kg,K_2O6.32kg。氮、磷、钾比例为1:0.3 4:0.94。干物质积累状况是出苗至现蕾期占4.5％,现蕾至盛花期占28.7％,盛花至成熟期占66.7％。各器官养分含量随株龄增加而依次降低。叶片中氮、磷含量高于茎杆,茎秆中含钾量较高。成熟期籽粒中氮、磷含量较高,依次是籽粒>叶>蒴壳>茎;含钾量是蒴壳>茎>叶>籽粒。

Field experiments were carried out for studying the dry matter accumulation and nutrition upfake by summer sesame. The amount of N,P_2O_5 and K_2O absorbed by the plant to produce 100kg seed was 6. 76kg,2. 31kg and 6. 32kg respectively in the yield level of 1755kg seed per hectare. The dry matter accumulation pattern in different growth stages was as follows: from seeding to square stage the dry matter yield was 4. 5% of the dry biomass yield,from square to peak flowering stage was 28. 7%,and from this stage to harvest was 66. 7%.