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RESPONSE OF MAIZE (Zea mays L.) TO PLANTING DENSITIES AND NITROGEN LEVELS UNDER LATE RABI CONDITIONS

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Title RESPONSE OF MAIZE (Zea mays L.) TO PLANTING DENSITIES AND NITROGEN LEVELS UNDER LATE RABI CONDITIONS
 
Creator ZAKKAM, MERCY
 
Contributor CHANDRASEKHAR, K
 
Subject planting, nitrogen, maize, yields, grain, crops, diseases, textural soil types, plant population, research methods
MAIZE (Zea mays L.), NITROGEN
 
Description A field experiment was conducted on clay loam soils of the Agricultural
College Farm, Bapatla to study the ‘Response of maize to planting densities
and nitrogen levels under late rabi conditions’ during the year 2010-11 under
irrigated condition. The treatments consisted combination of three planting
densities and four nitrogen levels arranged in a randomized block design with
factorial concept and were replicated thrice.
Plant height of maize was not influenced significantly by different
planting densities. The maximum plant height was attained when 240 kg N ha-1
was applied to the crop. However, no significant differences were observed
among 240, 200 and 160 kg N ha-1 in increasing the plant height. Higher
drymatter accumulation was observed with higher planting density of 133333
plants ha-1 significantly, than 66666 and 88888 plants ha-1. Application of 240
kg N ha-1 significantly enhanced the drymatter accumulation over 120, 160 and
200 kg N ha-1 at different stages of crop growth period. Lower planting density
lessened the number of days to 50 per cent tasseling, silking and barrenness of
maize over 88888 and 133333 plants ha-1. The number of days taken to 50 per
cent tasseling and silking and barrenness was significantly lowered when the
crop was fertilized with 240 kg N ha-1. Number of cobs per plant, number of
grains per cob, test weight and shelling percentage of maize were significantly
reduced with increase in planting density from 66666 to 133333 plants ha-1.
The yield parameters viz., cobs per plant, number of grains per cob, test
weight and shelling percentage recorded were the highest when the crop was
fertilized with 240 kg N ha-1. Application of 240 kg N ha-1 at lower planting
density of 66666 plants ha-1 resulted in significantly more cob length and grain
weight cob -1 over all other treatment combinations.
The grain yield of maize recorded at lower plant density of 66666 plants
ha was significantly higher than 88888 plants ha-1. However, it was on a par
with that obtained at 133333 plants ha-1. Stover yield produced by the planting
density of 133333 plants ha-1 was significantly higher and resulted in lower
harvest index than 88888 and 66666 plants ha-1. Nitrogen uptake by stover at
planting density of 133333 plants ha-1 with 240 kg N ha-1 was significantly
superior to all other treatment combinations. Whereas, in case of grain,
significantly higher nitrogen uptake was recorded with lower plant population
of 66666 plants ha-1 at 240 kg N ha-1. The highest net returns and returns per
rupee of investment were obtained with application of 240 kg N ha-1 at lower
planting density (66666 plants ha-1).
-1
Overall, the results showed that sowing of maize at a planting density of
66666 plants ha-1 was found optimum with a linear response up to
240 kg N ha-1 during late rabi conditi
 
Date 2016-06-03T09:10:09Z
2016-06-03T09:10:09Z
2011
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/66671
 
Language en
 
Relation D9010;
 
Format application/pdf
 
Publisher ACHARYA N. G. RANGA AGRICULTURAL UNIVERSITY