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Effect of Post‐Planting Residue Applications and Tillage on Nitrogen Accumulation and Partitioningin Maize ( Zea mays L.)
Author(s) -
Olness A.
Publication year - 1992
Publication title -
journal of agronomy and crop science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.095
H-Index - 74
eISSN - 1439-037X
pISSN - 0931-2250
DOI - 10.1111/j.1439-037x.1992.tb01042.x
Subject(s) - sowing , tillage , agronomy , nitrogen , residue (chemistry) , anthesis , poaceae , cover crop , crop residue , population , zea mays , mollisol , conventional tillage , biology , chemistry , soil water , cultivar , agriculture , ecology , biochemistry , demography , organic chemistry , sociology
Effects of a tillage‐surface crop residue combination on nitrogen (N) accumulation by maize were examined using a replicated field experiment. Crop residues, < 70 % surface cover, were applied a few days aftei planting conventional‐ and ridge‐tillage treatments. With < 30 % surface cover, total accumulated‐N decreased from about 4 to 2 g plant −1 as the plant population density (PPD) increased from 4 to 7 plants m −2 With < 70 % surface cover, total N accumulated averaged about 3 g plant −1 over the PPD range of 4 to / plants m −1 . At a PPD of about 5.5 plants m −2 , equal amounts of N were accumulated by plants in al treatments. Nitrogen accumulation was periodically monitored and fitted to a diphasic tanh(k[time]) model About 1.8 to 2.6 g of N and about 0.70 to 1.4 g of N were accumulated before and after anthesis respectively. Maximum N accumulation rates averaged about 92 and 60 mg plant −1 day −1 during vegetativt and reproductive growth‐stages, respectively. Total N accumulation during the vegetative growth‐stag declined exponentially as PPD increased; this may reflect a crop demand‐soil supply relationship.