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Sunflower performance — Agronomic aspects
Author(s) -
Jarvi Alvin J.
Publication year - 1983
Publication title -
journal of the american oil chemists' society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.512
H-Index - 117
eISSN - 1558-9331
pISSN - 0003-021X
DOI - 10.1007/bf02702090
Subject(s) - sunflower , hectare , agronomy , sowing , cultivar , growing season , seedling , environmental science , population , nutrient , moisture , biology , agriculture , geography , meteorology , ecology , demography , sociology
Sunflower performance is influenced by the cultivar, the environment, and the interaction of cultivar and environment. The environment is only partially controlled by the farmer and involves the interaction of many factors which vary greatly from day to day and from season to season. Good agronomic practices, which at least in part modify the environment, lead to the establishment of optimum use of the growing season. Plant population used in the major production areas range from 35,000 per hectare to 60,000 per hectare with planting depth ranging from 3 cm to 10 cm depending on soil moisture. Nitrogen is the most common limiting soil nutrient and generally as yields increase in response to nitrogen fertilizer there is a corresponding decrease in oil contents. Adequate weed control is very important during the first three weeks after emergence and is accomplished mechanically and/or chemically. Sunflower is frost‐tolerant during both the seedling stage and the post‐flowering period, and most susceptible during the period of rapid growth and flowering. Sunflower is not a highly drought‐resistant crop, but is effective in utilizing soil moisture to depth of over 2 m.