RRZNRegionales Rechenzentrum für Niedersachsen
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Nine treatments were examined as: control, recommended rate of zinc (RRZn) to soil @ 15 kg Zn2SO4 ha-1, foliar zinc spray (FZS) @ 0.1%, recommended rate of potassium to soil (RRK) @ 75 kg K2O ha-1, RRK + RRZn, RRK+ FZS, foliar potassium spray (FKS) at 1% concentration, FKS + RRZn, FKS + FZS.
The highest 1000 grain weight (g) and grain yield (kg ha-1) were recorded under the combined foliar spray of potassium and zinc (FKS + FZS), followed by FKS + RRZn and RRK+ FZS.
The field research consisted of treatments viz T1, Control (K0Zn0); T2, K0 + RRZn (recommended rate of zinc at soil @ 15 kg Zn2SO4 ha-1); T3, K0 + FZS (foliar zinc spray @ 0.1%); T4, RRK (recommended rate of potassium to soil @ 75 kg K2O ha-1) + Zn0; T5, RRK + RRZn; T6, RRK+ FZS; T7, FKS (1% foliar K spray) + Zn0; T8, FKS + RRZn; T9, FKS + FZS.
The plants fertilized with FKS + FZnS recorded less number of days (49.33) to reach 50% pollen shed, while there was no significant difference between FKS + RRZn and RRK + FZnS due to timely availability of potassium and high fertilizer use efficiency of maize.
Higher plant height was measured in FKS + FZnS followed by FKS + RRZn and RRK+ FZnS.
Highest number of grains per ear against the treatment i.e., FKS + FZnS followed by FKS + RRZn having number of grains per ear and statistically at par with RRK+ FZS were found (Table 2).
The maximum biological yield was observed in maize fertilized by potassium and zinc as spray on foliage (T9) followed by FKS + FZnS, RRK + FZnS and RRK + RRZn, respectively.