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Nutrition of Corn (Zea mays L.) on a Calcareous Soil: III. Interaction of Zinc and Boron with Plant Population and the Relationship between Grain Yield and Leaf Composition
Author(s) -
Fuehring H. D.
Publication year - 1966
Publication title -
soil science society of america journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.836
H-Index - 168
eISSN - 1435-0661
pISSN - 0361-5995
DOI - 10.2136/sssaj1966.03615995003000040027x
Subject(s) - calcareous , population , agronomy , sowing , yield (engineering) , boron , zinc , zea mays , nutrient , composition (language) , chemistry , horticulture , biology , botany , demography , materials science , organic chemistry , sociology , metallurgy , linguistics , philosophy
A field experiment on corn with N, Zn, Mn, B and plant population as variables resulted in important positive interactions of plant population with applied Zn and with applied B indicating that limited Zn or B may be part of the reason for the severe yield decrease resulting from planting corn too thickly. High rates of applied Zn or B (90–180 kg/ha) were depressing to grain yield at low plant populations (40,000–53,333 plants/ha) but increased yields at high plant populations (80,000–93,333 plants/ha). The logarithm of the nitrate‐N concentration of the midrib of the sixth corn leaf at the silking stage was found to be closely correlated with grain yield up to about 1,000 ppm. The relationship between the total N concentration of the leaf blades and grain yield was less distinct. The phosphate‐P concentration of the midrib and the total P concentration of the leaf blades were significantly increased by increasing applications of N. The B concentration of midribs at the point of maximum yield varied from < 60 ppm at low plant population to 120 ppm at high plant population.