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RESPONSE OF SESAMUM TO DIFFERENT LEVELS OF NITROGEN AND PHOSPHORUS IN THE SUMMER SEASON

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Title RESPONSE OF SESAMUM TO DIFFERENT LEVELS OF NITROGEN AND PHOSPHORUS IN THE SUMMER SEASON
 
Creator NAGANJALI, K
 
Contributor RADHA KRISHNA MURTHY, V
 
Subject RESPONSE, SESAMUM, DIFFERENT, LEVELS, NITROGEN, PHOSPHORUS, SUMMER, SEASON
 
Description A field experiment was conducted on red sandy soil at the Students’ Farm,
College of Agriculture, Rajendranagar, Hyderabad during summer, 2006. It had a
low level of 238 kg N/ha, but rich in phosphorus and potassium having 78.5 kg P2O5
and 313.38 kg K2O/ha. Sesamum variety ‘Swetha’ was tested with a combination of
four levels of 0, 50, 100, 150 kg N/ha with four levels of 0, 30, 60, 90 kg P2O5/ha.
These were replicated thrice. The layout was a Randomised Block Design. The data
was analysed following factorial approach.
The application of nitrogen did not increase the plant height and number of
leaves/plant of sesamum. The number of branches/plant increased significantly at
60, 75 days after sowing and at harvest by the application of 50 kg N/ha. The
application of phosphorus did not improve these vegetative characters at any stage.
The crop fertilized with 100 kg N/ha accumulated significantly more quantity of dry
matter per plant from 45 days after sowing until harvest. But, phosphorus on the
other hand deterred the dry matter accumulation compared to control. The crop
removed more nitrogen with increasing levels of this nutrient upto 150 kg/ha at
harvest. The crop fertilized with 50 kg P2O5/ha removed significantly more quantity
of P at 60 days after sowing. It removed significantly larger quantities of K at 60 and
75 days after sowing and at harvest in response to the application of 100 kg N/ha.
The removal of N, P or K was not influenced by the application of phosphorus.
The crop fertilized with 150 kg N/ha produced maximum number of capsules
per plant at 60 days after sowing. Later, at 75 days after sowing and at harvest, the
number of capsules were at par by fertilizing it with 50, 100 or 150 kg N/ha and
significantly more than in control. Maximum number of seeds per capsule were
realized by the application of 100 kg N/ha. The test weight and seed yield/plant
increased even with a low dose of 50 kg N/ha. The effect of phosphorus was
inconsistent. Sesamum produced a mean seed yield of 235 kg and stover yield of
1118 kg/ha in control. Significantly more seed yield of 332 kg and stover yield of
1532 kg/ha was obtained by the application of 50 kg N/ha. The production was on
par at high levels of 100 and 150 kg N/ha. Phosphorus had no effect. A quadratic
response function: Y = 233.9766 + 2.6943 N – 0.0136 N2 …… R2 = 0.68 was best
filled to characterize yield response to nitrogen. The optimum economic dose was 79
kg N to realize seed yield of 361 kg/ha with a net profit of Rs 697/ha. The maximum
dose was 98 kg N for estimated maximum production of 367 kg/ha. Graphs
indicating response surfaces for levels of N and P on seed yield and contours
indicating the quantity of these fertilizers for different yield levels are also
displayed.
The crop grown without the application of nitrogen had 41.39% oil in the
seed and the oil yield was 102.7 kg/ha. Application of 50 kg N increased the oil
content to 43.04 per cent and the oil yield to 142.9 kg/ha. Application of 30 kg
P2O5/ha also increased the oil content significantly. The protein content of seed was
not influenced by N or P.
Maximum net returns of Rs 2,351/ha were realized from the crop fertilized
with 100 kg N/ha compared to Rs 751/ha from the unfertilized control. But,
maximum profit of Rs 0.53 per rupee investment was realized by the application of
50 kg N/ha. The application of phosphorus was uneconomical.
The soil nutrient budget revealed that the balance of N and P was more after
the harvest of the crop grown without the addition of fertilizers compared to the
initial soil test values. Fertilizer additions further improved the soil fertility. The
available K was also more than the initial level.
 
Date 2016-08-17T11:00:46Z
2016-08-17T11:00:46Z
2006
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/72692
 
Language en
 
Relation D7852;
 
Format application/pdf
 
Publisher ACHARYA N.G. RANGA AGRICULTURAL UNIVERSITY, RAJENDRANAGAR, HYDERABAD