TY  - BOOK
AU  - Makdoh, Badapmain 
AU  - Vishram Ram
ED  - Vishram Ram
TI  - Performance of quality protein maize(Zea mays.L) (QPM) varieties in response to Nitrogen levels
U1  - 633.1584 
PY  - 2011///
CY  - Umiam
PB  - CPGS,CAU
KW  - Maize-Nitrogen levels
KW  - Maize-yield
N2  - Abstract:

A field experiment was conducted at the upland Agronomy Research farm of the ICAR RC for NEH Region, Umiam during kharif of 2010 to study the response of Quality Protein Maize maize varieties at varying nitrogen levels. The experiment was laid out in Split plot design with three replications. Three varieties viz. HQPM 1, HQPM 2 and RCM 1-1 (check) and four nitrogen levels of 0, 50,100,150 kg ha-1 were taken as main plot and sub-plot respectively with 12 treatment combinations. Nitrogen application significantly increased the grain yield up to highest level, but no significant difference was observed between the yield of 100 and 150 kg Nha-1. Among varieties HQPM 2 produce maximum grain yield (6.14 t ha-1). Plant height increases with increasing levels of N, whereas 100 and 150 kg Nha-1 were at par with each other and the tallest plant was found in RCM1-1. However, maximum leaf area, LAI, chlorophyll content as well as dry matter production was obtained with HQPM 2 and all the parameters remained highest with 150 kg Nha-1 . Growth parameters like CGR and NAR were found to increase with N levels and more significantly at 30-60 days stage, whereas RGR shows decreasing rate with increase N levels. In general, the yield attributes viz. cob weight, cob length, cob girth, and kernels weight cob-1, number of kernels cob-1 , number of rows cob-1, test weight and shelling % were found to increase with the levels of N and associated with HQPM 2. Harvest index decreases with increasing N levels and the highest value was recorded in 37.6%. Days to 50%  flowering as found to decrease with N levels and variety HQPM 2 takes more days to flower. NPK uptake increases as the N levels increases and the highest value recorded in HQPM 2. HQPM 1 and HQPM 2 significantly increases in grain protein content as the N levels  increases and, whereas RCM 1-1 shows declining trend beyond 100 kg Nha-1. The B: C ratio of the highest N level is the highest (1.99:1) and variety HQPM 1 and HQPM 2 were at par
ER  -