Correlation and regression studies of SPAD based leaf nitrogen estimation as impacted by nitrogen and zinc management under medium land rice in Alfisols of Odisha
DOI:
https://doi.org/10.14719/pst.2810Keywords:
Rice, Nitrogen, Zinc, SPAD value, Leaf nitrogen content, Correlation-regressionAbstract
One of the most significant staple crops in the world is rice (Oryza sativa L.), its productivity largely depends on various factors, including nutrient management. In particular, nitrogen and zinc management play crucial roles in rice cultivation as they significantly impact the leaf nitrogen content, which is closely associated with plant growth, photosynthesis and ultimately grain yield. Field tests were conducted at the Agricultural Research Station, Chhatabara, SOA (Deemed to be University), Bhubaneswar, Odisha, India during the kharif of 2021 and 2022 to measure the effect of nitrogen and zinc management on the productivity of rice crop yield. Split plot design was employed in this experiment in 3 replications The findings of the experiment revealed that 125 % higher the recommended dose of nitrogen (RDN) gave significantly the highest pooled, periodic SPAD values, leaf nitrogen contents, grain (5700 kg/ha) and straw yield (6880 kg/ha) respectively. This was at par with the treatment where 75 % of the RDN was supplied through Urea and the rest 25 % through FYM. Among the zinc management practices, one soil application and 3 foliar sprays of zinc sulfate @ 2.5 kg/ha and 0.5 % respectively, at the stages of active tillering, heading and panicle initiation yielded significantly than the other treatments. The SPAD value and leaf nitrogen content showed a positive correlation with grain and straw yields in rice crops across different growth stages and years.
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