TY  - JA
AU  - Steele,K.W.
AU  - Brown,N.S.
AU  - McCormick,S.J.
AU  - Percival,N.
TI  - Nitrogen, phosphorus, potassium, magnesium, and sulphur requirements for maize grain production
PY  - 1981///
T2  - New Zealand Journal of Experimental Agriculture
ER  -