Effect of phosphorus fertilization and microbial inoculants on yield, phosphorus use-efficiency and available phosphorus in maize (Zea mays)- wheat (Triticum aestivum) cropping system

IMMANUEL C HAOKIP; B S DWIVEDI; MAHESH C MEENA; S P DATTA; V K SHARMA; Y S SAHARAWAT

doi:10.56093/ijas.v89i5.89662

Authors

IMMANUEL C HAOKIP PhD Scholar, ICAR-Indian Agricultural Research Institute, New Delhi 110 012, India
B S DWIVEDI Head, ICAR-Indian Agricultural Research Institute, New Delhi 110 012, India
MAHESH C MEENA Senior Scientist, ICAR-Indian Agricultural Research Institute, New Delhi 110 012, India
S P DATTA Professor, ICAR-Indian Agricultural Research Institute, New Delhi 110 012, India
V K SHARMA Principal Scientist, ICAR-Indian Agricultural Research Institute, New Delhi 110 012, India
Y S SAHARAWAT Principal Agronomist, International Center for Agriculture Research for Dry Areas (ICARDA), Kabul, Afghanistan

https://doi.org/10.56093/ijas.v89i5.89662

Keywords:

Apparent recovery, Maize-wheat system, Microbial inoculants, Phosphorus use-efficiency

Abstract

A field experiment was conducted between 2012-14 to investigate the effect of different phosphorus levels (control-no P, 33% P, 50% P, 100% P and 100% P in 3-splits of the recommended dose of P) and microbial inoculants (un-inoculated control, arbuscular mycorrhizal fungi, AM phosphate solubilising bacteria, PSB and AM+PSB) in maize-wheat system. The study revealed that the maize and wheat grain yields were increased by 20% and 40%, respectively, under 100% P which were significantly higher over control. The total P uptake by maize and wheat varies from 11.7â€“20.7 kg/ha and 17.7â€“32.4 kg/ha, respectively. The highest apparent recovery (AR) in both the crops was recorded when 50% P was added with AM+PSB inoculation whereas, a significant reduction in AR was recorded with increase in fertilizer P beyond 50% of recommended P. Agronomic efficiency was highest under 50% P averaged across microbial inoculants in both maize (32.5 kg grain/kg P) and wheat (78.5 kg grain/kg P). Grain yield of both maize and wheat was significantly and positively correlated with Olsen P content at tasseling (r = 0.30*) and panicle emergence (r = 0.35**). The higher P use-efficiency under 50% recommended P along with microbial inoculants suggests applying lower doses of P fertilizer along with microbial inoculants to achieve optimum yield in maize-wheat system without any adverse impact on soil fertility.

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