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RESPONSE OF MULTICUT FODDER SORGHUM [Sorghum bicolor (L.) Moench] TO NITROGEN AND ZINC

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Title RESPONSE OF MULTICUT FODDER SORGHUM [Sorghum bicolor (L.) Moench] TO NITROGEN AND ZINC
 
Creator RAMAMOHAN RAO, DEVARAKONDA
 
Contributor VENKATESWARLU, B
 
Subject harvesting, nitrogen, sorghum, yields, zinc, biological phenomena, planting, diseases, developmental stages, seasons
SORGHUM, Sorghum bicolor (L.) Moench
 
Description A field experiment entitled “Response of Multicut Fodder
Sorghum [Sorghum bicolor (L.) Moench] to Nitrogen and Zinc” was conducted
at the Agricultural College Farm, Bapatla on a clay loam soil during rabi and
summer seasons, 2007-08. The experiment was laid out in RBD with factorial
concept comprising of 13 treatments with three replications. The treatments
consisted of four Nitrogen levels i.e. 40, 80,120 and 160 kg ha-1, and three
Zinc levels viz; 10, 20 and 30 kg ha-1 with an absolute control.
The significantly tallest plants (264.0, 211.0 and 177.0 cm), highest
number of leaves hill-1 (54.3, 34.0 and 21.1), number of tillers hill-1 (3.3, 3.5
and 3.7), leaf to stem ratio (0.55, 0.50 and 0.40), total chlorophyll content
(40.9, 36.3 and 27.2 SPAD Readings) and drymatter accumulation (9.69, 9.51
and 5.55 t ha-1) were registered by 160 kg N ha-1 during first, second and third
cuts.
The influence of Zinc on bio-metric parameters during the first, second
and third cuts was non-significant.
Days to flower initiation and days to harvest gradually decreased from
the first to third cuts. It was also observed that days to flower initiation and
harvest numerically decreased with the increase in Nitrogen and Zinc levels.
Lower number of days to flower initiation (50.4, 38.4 and 31.2) and days to
harvest (61.2, 44.8 and 39.4) were recorded with 160 kg N ha-1 whereas the
highest number of days to flower initiation (60.0, 45.0 and 42.7) and days to
harvest (68.0, 58.3 and 54.3) were registered in the control.
Higher green (40.6, 29.3 and 19.7 t ha-1) and dry fodder yields (15.6,
9.1 and 7.9 t ha-1) were observed with 160 kg N ha-1 during first, second and
third cuts.
Non significant increase in green and dry fodder yields was observed
with each increment in fertilizer Zinc upto 30 kg ha-1 during all the three cuts.
Significant influence of the different treatments on the quality
parameters viz., crude protein, crude fibre and total ash content were noticed
at various stages of the crop growth. The highest crude protein (8.6, 7.5 and
6.6 percent), total ash content (9.7, 8.6 and 8.6 per cent) and the lowest crude
fibre (20.9, 22.9 and 24.2 per cent) content were recorded by the application
of 160 kg N ha-1, while the lowest crude protein (4.3, 3.3 and 2.5 percent),
total ash content (5.6, 4.4 and 3.9 percent) and the highest crude fibre (34.2,
37 .1 and 38.8 percent) were recorded in control treatment.
At all the three cuts, non-significant impact of Zinc fertilization on
quality parameters viz., crude protein, crude fibre and total ash content was
observed.
Significantly higher per day production (663.4, 655.8 and 499.0
kg
ha-1 green fodder) was recorded with 160 kg N ha-1. The lowest (142.5, 119.3
and 63.1 kg ha-1) were recorded in the control treatment during the first,
second and third cuts, respectively.
The highest nitrogen uptake of 76.50, 54.88 and 36.20 kg ha-1 and Zn
content (81.64, 56.21 and 26.66 ppm) was registered by applying 160 kg N
ha-1. The lowest nitrogen uptake (19.85, 14.39 and 6.96 kg ha-1) and the
lowest Zn content (64.47, 37.28 and 7.45 ppm) were registered by the control
treatment during first, second and third cuts.
The highest residual available N (194.67 kg ha-1) was registered by 160
kg ha-1, while highest Phosphorus (72.28 kg ha-1) and Potassium (762.90kg
ha-1) and zinc (0.44 ppm) were registered by control treatment. The lowest
residual available Nitrogen (182.73 kg ha-1), Phosphorus (42.86 kg ha-1),
Potassium (517.20kg ha-1) and Zn (0.33 ppm) were registered by the
application of 30 kg Zn ha-1.
Economics of the multicut fodder sorghum indicated that the highest
gross returns (Rs.35, 760 ha-1), net returns (Rs.23, 894 ha-1) and benefit cost
ratio (2.01) were registered with 160 kg N ha-1. Among the Zn levels tried, the
highest gross returns (Rs.27,680 ha-1) were recorded by 30 kg Zn, net returns
(Rs.13,531 ha-1) were recorded by 20 kg Zn ha-1 and benefit cost ratio (1.14)
was recorded by 10 kg Zn ha-1 and the lowest gross returns (Rs. 8,040 ha-1),
net returns (Rs.840 ha-1) and benefit cost ratio (0.11) were recorded by control
treatment.
Based on the results of the present investigation it can be concluded
that for realizing higher yields of multicut fodder sorghum, application of 160
kg ha-1 nitrogen found to be ideal. However, the response at higher levels,
needs to be confirmed by further research by increasing the nitrogen dose.
Since there was no significant difference among zinc levels, zinc
application can be restricted to 10 kg ha-1 to maintain the quality of fodder
sorghum.
 
Date 2016-06-02T10:03:50Z
2016-06-02T10:03:50Z
2010
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/66601
 
Language en
 
Relation D9009;
 
Format application/pdf
 
Publisher ACHARYA N.G. RANGA AGRICULTURAL UNIVERSITY