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SOIL TEST CROP RESPONSE CORRELATION STUDIES IN CABBAGE

KrishiKosh

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Title SOIL TEST CROP RESPONSE CORRELATION STUDIES IN CABBAGE
 
Creator SWETHA, G
 
Contributor YAKADRI, M
 
Subject SOIL, TEST, CROP, RESPONSE, CORRELATION, STUDIES, CABBAGE
 
Description A field experiment was conducted on soil test crop response correlation studies
in cabbage during rabi season 2005-06 after creating a fertility gradient by growing
fodder Jowar variety SSG -59-3 in the preceding kharif. Fertilizers were applied at the
rate of 150: 75: 100 kg/ha N P K in the 1 strip of fodder sorghum. Twice this level was
fertilized in the 2 strip and the third was unfertilized. This created wide fertility
gradients after the harvest of sorghum. The soil available nitrogen was 250, 295 and 577
kg/ha in the 0 X, 1 X and 2 X strips against the initial value of 188 kg N /ha. The soil
available phosphorus was 38, 62 and 89 kg/ha in the respective strips against the initial
value of 70 kg P2O5 /ha. The soil available potassium was 265, 288 and 377 kg/ha. The
variable fertility gradients were reflected in variable yield. The crop produced 1.51, 3.19
and 4.14 q grain with a production of 23.45, 62.90 and 70.85 q/ha fodder in the three
fertility gradients and satisfied the pre requisite for soil test crop response studies.
Cabbage var. Golden Acre was sown on 5-09-2005 and planted on 9-10-2005 in
the three fertility gradients created by the exhaust crop. There were 21 fertilizer
treatments with combination of N P K and three unfertilized controls in each strip. The
results showed substantial improvement in plant height, plant spread and dry weight per
plant with improvement in the fertility gradient from 0 X,1 X and further to 2 X
The crop responded to grow tall with wider spread and accumulated more dry
matter by the application of 100 kg N, 40 kg P2O5 and 40 kg K2O/ha at different growth
stages. This response was more prominent in the 2 X than 1 X compared to the 0 X
fertility gradient. The crop grown in 1 X or 2 X fertility gradients removed more N P K
than in 0 X gradient. It removed large quantities of nitrogen by the application of 100
kg N/ha in the 0 X fertility gradient, 200 kg N/ha in the 1 X and 300 kg N/ha in the 2 X
fertility gradient. But, it required 200 kg N/ha to remove more quantity of phosphorus
and potassium in the three fertility gradients. The crop fertilized with 80 kg P2O5 and
120 kg K2O /ha removed more N P K than their lower levels.
The yield components viz; the mean height, diameter and volume of cabbage
heads improved remarkably with improvement in the fertility gradients. Maximum yield
of 137.59 q/ha yield was obtained from the 2 X fertility gradient compared to 121.22
q/ha in the 1 X fertility gradient. Very low yield of only 86.43 q/ha was obtained from
the 0 X fertility gradient. The application of 100 kg N/ha increased its height, diameter
and volume of cabbage substantially over control. At this rate of application the crop
yielded 102.57 q/ha compared on the low yields of 27.82 q/ha without the application of
nitrogen in the 0 X fertility gradient. The production levels were high in 1 X and 2 X
fertility gradients. The yield was 45.11 and 133.46 q/ha in control and due to the
application of 100 kg N/ha in the 1 X fertility gradient. The corresponding yield was
54.17 and 145.79 q/ha in the 2 X fertility gradient. The crop also responded to improve
the yield components and yield of cabbage by the application of 40 kg P2O5 and 40 kg
K2O /ha in the three fertility gradients. Response surfaces for N P, N K and P K with
yield of cabbage are presented through three dimensional response surfaces. Contours
for yield giving an option of the quantity of nutrients to be combined are also presented
graphically. Maximum profit of Rs 98 037 /ha was realized by fertilizing the crop with
300 kg N/ha. While the most profitable input level per rupee investment was by the
application of 100 kg N/ha in the 2 X fertility gradient. The application of 40 kg P2O5
and 40 kg K2O /ha was also the profitable levels.
The regression model characterizing the impact of soil nutrients on yield of
cabbage was best described by the function.
Y = 12920 + 12.79 SN – 0.0326 SN2 – 112.20 SP + 1.3448 SP2 – 65.92 SK +
0.1076 SK2 - - - R2 = 0.93
The multiple quadratic equation for yield estimation by the influence of N P K
available in the soil, added through fertilizers and their interactions,
Y = -18354.95 + 95.56**FN – 0.2020**FN2 + 159.79**FP – 0.9099**FP2 +
88.28FK – 0.8646 FK2 + 7.47SN + 0.0273SN2 + 256.77SP –
0.8510SP2 + 4.02SK – 0.0096 SK2 – 0.0464 FNSN – 0.4055
FPSP + 0.1324 FKSK ………… R2 = 0.81
The + - - response coefficients were attained for nitrogen and phosphorus.
Therefore the fertilizer adjustment equations for soils with variable amounts of these
nutrients were developed to estimate the maximum yield, maximum profit and desired
rate of returns. The equations for maximum profits were.
F N = 236 – 0.114 SN – 2.475 R
F P2O5 = 87.80 - 0.222 SP – 0.549 R
A ready reckoner of fertilizer prescriptions to suit soils with different levels of
these nutrients are presented for 150 and 200 q/ha of cabbage from the following
equations.
F N = 2.6651 T – 0.6261 SN
F P2O5 = 1.041 T – 0.9155 SP
F K2O = 0.8205 T – 0.0948 SK
The soil nutrient budget showed that the application of nitrogen even up to 300
kg N/ha depleted the soil seriously to less than the initial value in the three fertility
gradients. The soil phosphorus also depleted by growing the crop without fertilizer
application but exceeded the initial value by fertilizing the crop with increase the level
of phosphorus up to 120 kg K2O /ha. The soil was enriched with available potassium in
unfertilized or fertilized plots invariably in the three fertility gradients.
 
Date 2016-08-16T14:32:59Z
2016-08-16T14:32:59Z
2006
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/72609
 
Language en
 
Relation D7841;
 
Format application/pdf
 
Publisher ACHARYA N.G. RANGA AGRICULTURAL UNIVERSITY, RAJENDRANAGAR, HYDERABAD