Vol. 7, Issue 5 (2019)
Evaluation of leaf colour chart based fertilizer nitrogen management technology using pau-lcc in transplanted rice (Oryza sativa L.)
Author(s): Amandeep Singh and Varinder Pal Singh
Abstract: Over and untimely applications of fertilizer nitrogen (N) are the major constrains in improving fertilizer N recovery efficiency in transplanted rice. Large spatial and temporal variability further lower fertilizer N recovery efficiency when broad based blanket recommendations are followed. The field experiment was carried out using four rice varieties (PR 121, PR 122, PR 123 and PR 124) laid in split plot design with eight treatments and three replications to study need based fertilizer nitrogen management using PAU- leaf colour chart in transplanted rice. Close linear relationship (R2=0.732, n= 504) between PAU-LCC score and SPAD meter readings suggests that PAU-LCC can be used as economical substitute to SPAD for making need based fertilizer N topdressings in transplanted rice. The PAU-LCC 4 guided N applications produced grain yield equivalent to soil test based N applications with the saving of 60 kg N ha-1. Whereas, PAU-LCC 4.5 guided N management improved grain yield production by 8.47 percent with the use of fertilizer N equivalent to soil test based N management. The basal N dose can be delayed till 10 DAT while using threshold leaf greenness of PAU-LCC 4.5 in different rice varieties.
Pages: 344-349 | 420 Views 140 Downloads
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How to cite this article:
Amandeep Singh, Varinder Pal Singh. Evaluation of leaf colour chart based fertilizer nitrogen management technology using pau-lcc in transplanted rice (Oryza sativa L.). Int J Chem Stud 2019;7(5):344-349.
