Nitrogen-management strategy through leaf-colour chart and SPAD meter for optimizing the productivity in irrigated wheat (Triticum aestivum)

Sumit Sow; GARIMA SINGH; MAINAK GHOSH; SWARAJ KUMAR DUTTA; NINTU MANDAL; SANJAY KUMAR; SHIVANI RANJAN

doi:10.59797/ija.v68i2.364

Authors

SUMIT SOW Bihar Agricultural University, Sabour, Bhagalpur, Bihar 813 210
GARIMA SINGH Bihar Agricultural University, Sabour, Bhagalpur, Bihar 813 210
MAINAK GHOSH Bihar Agricultural University, Sabour, Bhagalpur, Bihar 813 210
SWARAJ KUMAR DUTTA Bihar Agricultural University, Sabour, Bhagalpur, Bihar 813 210
NINTU MANDAL Bihar Agricultural University, Sabour, Bhagalpur, Bihar 813 210
SANJAY KUMAR Bihar Agricultural University, Sabour, Bhagalpur, Bihar 813 210
SHIVANI RANJAN Bihar Agricultural University, Sabour, Bhagalpur, Bihar 813 210

DOI:

https://doi.org/10.59797/ija.v68i2.364

Keywords:

Leaf colour chart, N use efficiency, SPAD meter, Wheat

Abstract

A field experiment was conducted during the winter (rabi) season of 2020–21 at Bihar Agricultural University, Sabour, Bhagalpur, to study the effect leaf-colour chart (LCC) and SPAD meter on productivity of irrigated wheat (Triticum aestivum L.). The experiment, having 8 treatments, was laid out in a randomized block design. The first 4 treatments (T₁ to T₄ ) were LCC-based, T₅ and T₆ were the SPAD meter-based management practices and T₇ was considered as fixed-time N management (FTNM) and T₈ was kept as control where no N was applied. The SPADbased treatments T₅ and T₆ received 140 kg N/ha which was higher than all the other N management treatments resulted 13% higher ears/m2 and 18% higher grains/ear over the LCC-based N-management treatments. Among the LCC-based practice, treatment T₄ recorded significantly highest grain yield (4.01 t/ha) but was lower (10.4%) than that of grain yield achieved in T₅ treatment. The LCC-based treatments T₁ to T₃ though received a lower dose of N fertilizer (19%; average of T₁ to T₃ ) compared to the FTNM (T₇ ), returns maintained the similar yield components with the FTNM. Therefore, use of farmers’ friendly and cost-effective tool LCC is very useful which saved the N fertilizer (19%) without hampering the yield components. Thus, LCC and SPAD may be effective tool for efficient need-based fertilizer N management using LCC and SPAD meter in improving crop growth for higher productivity in rational manner.

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