Author(s):

Santosh Kumar Chaudhary, MP Yadav, DD Yadav, Nausad Khan, DK Mahto, Sushil Kumar Yadav and Anjani Kumar Singh

Abstract: Leaf colour chart (LCC) is an easy to use and inexpensive diagnostic tool for monitoring the relative greenness of a rice leaf as an indicator of the plant N status. We conducted an experiment at Chandra Shekhar Azad University of Agriculture and Technology, Kanpur (India), during 2010-11 and 2011-12 to compare plant growth and yield of three different rice cultivars (PA-6444, PHB-71 and NDR-359) by applying N based on leaf colour chart. Among these varieties, PA-6444 recorded tallest plant (115.32 cm), highest number of shoot (374 m^-2) and highest dry matter (1090 g m^-2) at the time of harvest. PA-6444 recorded significantly highest number of panicle (307.62 m^-2) over PHB-71 (291.17 m^-2) and NDR-359 (275.38 m^-2). Although, panicle length (28.80 cm) and number of grain per panicle (229.97) was recorded significantly higher in NDR-359, over both the remaining cultivars. Among rice cultivars significantly maximum grain yield (59.21 q ha^-1), and biological yield (140.10 q ha^-1) recorded by PA-6444. Among LCC scores, LCC<5+25%N as basal through urea, recorded highest grain and biological yield 62.80, and 148.59 q ha^-1respectively and was significantly higher over rest of the LCC scores except LCC<5+25%N as basal through FYM. From this experiment it has been concluded that LCC<5+25% N as basal through FYM with cultivars PA-6444 can be used as a low cost technology for maximum production per unit area.

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