Evaluation of urea loaded nanoclay biopolymer composites with Zn and P solubilizing microbes for nitrogen uptake and use efficiency in maize (Zea mays)-wheat (Triticum aestivum) cropping system

ASHEESH  KUMAR; K M  MANJAIAH; V K  SHARMA; KAPIL A  CHOBHE; ARCHNA  SUMAN; ARTI  BHATIA; RAVI  SAINI; SIYARAM  MEENA; A NAVEEN  KUMAR; DIBAKAR  ROY

doi:10.56093/ijas.v94i3.142046

Authors

ASHEESH KUMAR ICAR-Indian Agricultural Research Institute, New Delhi 110 012, India
K M MANJAIAH ICAR-Indian Agricultural Research Institute, New Delhi 110 012, India
V K SHARMA ICAR-Indian Agricultural Research Institute, New Delhi 110 012, India
KAPIL A CHOBHE ICAR-Indian Agricultural Research Institute, New Delhi 110 012, India
ARCHNA SUMAN ICAR-Indian Agricultural Research Institute, New Delhi 110 012, India
ARTI BHATIA ICAR-Indian Agricultural Research Institute, New Delhi 110 012, India
RAVI SAINI ICAR-Indian Agricultural Research Institute, New Delhi 110 012, India
SIYARAM MEENA ICAR-Indian Agricultural Research Institute, New Delhi 110 012, India
A NAVEEN KUMAR ICAR-Indian Agricultural Research Institute, New Delhi 110 012, India
DIBAKAR ROY ICAR-Indian Agricultural Research Institute, New Delhi 110 012, India

https://doi.org/10.56093/ijas.v94i3.142046

Keywords:

Maize-wheat cropping system, Nano clay bio-polymer composites, Nitrogen uptake, Nitrogen use efficiency, Zn and P solubilizing microbial culture

Abstract

A field experiment was conducted during rainy (kharif) 2022 (July 2022–October 2022) and winter (rabi) 2022–23 (November 2022–March 2023) seasons at ICAR-Indian Agricultural Research Institute, New Delhi to evaluate a series of Zn and P solubilizing microbial culture enriched nanoclay biopolymer composite (NCBPC) loaded with nitrogenous fertilizer (urea) and the efficiency of the products for maize (Zea mays L.) and wheat (Triticum aestivum L.). Experiment consisted of 10 treatments, viz. T1, Control; T2, 100% N though urea; T3; T5; T7; and T9, 75% N as urea loaded NCBPC-A (prepared using acrylic acid + acrylamide + mango kernel flour) alone or along with P or Zn or P + Zn solubilizers; T4; T6; T8 and T10, 75% N as urea loaded NCBPC-B (prepared using acrylic acid + acrylamide + maize flour) alone or along with P or Zn or P + Zn solubilizers in a randomized block design (RBD) and replicated thrice. In both maize and wheat crop, highest grain (5.09 and 5.32 t/ha) and straw yield (6.56 and 7.45 t/ha), apparent N recovery (51.26 and 47.26%) and agronomic efficiency (12 and 13.3 kg grain yield obtained/kg N application) were obtained in treatment T₁₀ followed by T₉. In addition, total N uptake significantly enhanced by 20.1–28.4% in maize and 22.1–30.8% in wheat (T₉ and T₁₀); apparent nitrogen recovery (ANR) improved by 12.9–18.2 and 15.2–21.1% and agronomic efficiency (AE) triggered by 19.5–21.2 and 15.4–20.8% in maize and wheat crops respectively, under T₉ and T₁₀ treatments over standard urea fertilization (T₂). Thus, the study concludes that, 25% N requirement could be cut down through application of 75% N (urea) loaded NCBPCs in conjunction with Zn or P or Zn + P solubilizing microbial culture as compared to sole urea application under maize-wheat cropping system.

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