The Journal of Research ANGRAU
Contents of 41(1) 2013 - acharya ng ranga agricultural university
Contents of 41(1) 2013 - acharya ng ranga agricultural university
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J.Res. <strong>ANGRAU</strong> 41(1) 20-29, 2013<br />
INFLUENCE OF INTEGRATED NUTRIENT MANAGEMENT ON PHYSICAL<br />
PROPERTIES OF ALFISOLS UNDER RICE –RICE CROPPING SYSTEM IN<br />
SOUTHERN TELANGANA ZONE<br />
V. MAHESWARA PRASAD and P. PRABHU PRASADINI<br />
DAATT Centre, Krishna District, Machilipatnam - 521002<br />
Date <strong>of</strong> Receipt :07.12.2012 Date <strong>of</strong> Acceptance : 31.01.2013<br />
ABSTRACT<br />
Studies were conducted to understand the influence <strong>of</strong> integrated nutrient management on physical properties<br />
<strong>of</strong> Alfisols under rice-rice cropping system during 2005-06 and 2006-07 at Agricultural College Farm, Rajendranagar,<br />
Hyderabad. <strong>The</strong> bulk density, porosity and water holding capacity did not change significantly by the application <strong>of</strong><br />
different levels <strong>of</strong> fertilizers in both kharif and rabi season compared to the unfertilized soil. <strong>The</strong> application <strong>of</strong> 50%<br />
recommended dose <strong>of</strong> 120:60:60 kg ha -1 NPK integrated with 50% N fertilizer equivalent through FYM, paddy straw<br />
or glyricidia in kharif season followed by the application <strong>of</strong> recommended dose <strong>of</strong> 120:60:60 kg NPK ha -1 through<br />
fertilizers in rabi season significantly reduced the bulk density and porosity in the upper 0-15 cm and increased the<br />
water holding capacity upto 30 cm depth. Similar change in the physical properties was observed due to application<br />
<strong>of</strong> 75% recommended dose <strong>of</strong> fertilizers integrated with 25% N fertilizer equivalent through any one <strong>of</strong> the three<br />
organic sources in kharif season and application <strong>of</strong> 75% recommended dose <strong>of</strong> fertilizers in rabi. <strong>The</strong> improvement<br />
in the rate <strong>of</strong> infiltration <strong>of</strong> water and hydraulic conductivity was recorded only at the transplanting stage and was not<br />
consistent during the two seasons.<br />
<strong>The</strong> soil physical properties play an<br />
important role in determining its suitability for crop<br />
production. Soil should be physically fertile to provide<br />
a good crop growth medium. This is greatly influenced<br />
by several management practices. Soil physical<br />
properties such as water holding capacity, bulk<br />
density, total porosity, air-filled porosity, hydraulic<br />
conductivity, and soil-depth greatly influence root<br />
development which in turn influence plant growth and<br />
performance. Rice –rice is the most predominant<br />
cropping system in the Andhra Pradesh, particularly<br />
in southern telangana zone. <strong>The</strong> major problem is<br />
the deterioration <strong>of</strong> soil physical properties due to<br />
continuous puddling and impaired soil fertility due to<br />
indiscriminate application <strong>of</strong> nutrients through the<br />
fertilizers with the threat <strong>of</strong> the declining productivity.<br />
<strong>The</strong> use <strong>of</strong> locally available organic sources<br />
has higher potential to improve the soil physical<br />
properties that is in terms <strong>of</strong> water holding capacity,<br />
soil porosity and bulk density, soil fertility and there<br />
by soil quality as a whole sustain the level <strong>of</strong> crop<br />
productivity in the Rice –rice cropping system.<br />
Hence, an investigation was made to understand the<br />
influence <strong>of</strong> integrated nutrient management (INM)<br />
on physical properties <strong>of</strong> Alfisols under rice-rice<br />
cropping system.<br />
MATERIALS AND METHODS<br />
<strong>The</strong> Present studies were conducted in two<br />
consecutive years 2005-06 and 2006-07 at<br />
Agricultural College Farm, Rajendranagar,<br />
Hyderabad. <strong>The</strong> experiment was conducted on a<br />
sandy clay loam soil on which only rice was grown<br />
continuously in both Kharif and Rabi seasons since<br />
1988. <strong>The</strong> experiments were laid out in randomized<br />
block design with 12 treatments in three replications.<br />
Rice variety; RNR 23064 was planted adopting a<br />
spacing <strong>of</strong> 20 cm x 10 cm in 59.8 m 2 sized plot. <strong>The</strong><br />
treatments comprised <strong>of</strong> control treatment with out<br />
fertilizers and organic manures (T 1<br />
), 50 %<br />
Recommended NPK dose through fertilizers (T 2<br />
), 50<br />
% Recommended NPK dose through fertilizers (T 3<br />
),<br />
75 % Recommended NPK dose through fertilizers<br />
(T 4<br />
), 100 % Recommended NPK dose through<br />
fertilizers 120:60:60 kg ha -1 (T 5<br />
), 50 % Recommended<br />
NPK dose through fertilizers + 50 % N through FYM<br />
(T 6<br />
), 75 % Recommended NPK dose through<br />
fertilizers + 25 % N through FYM (T 7<br />
), 50 %<br />
Recommended NPK dose through fertilizers + 50 %<br />
N through paddy straw (T 8<br />
), 75 % Recommended<br />
NPK dose through fertilizers + 25 % N through paddy<br />
straw (T 9<br />
), 50 % Recommended NPK dose through<br />
fertilizers + 50 % N through glyricidia (T 10<br />
), 75 %<br />
Recommended NPK dose through fertilizers + 25 %<br />
email: vemulamadamp@gmail.com<br />
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