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Measuring potassium fractions is not sufficient to assess the long-term impact of fertilization and manuring on soil’s potassium supplying capacity

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Title Measuring potassium fractions is not sufficient to assess the long-term impact of fertilization and manuring on soil’s potassium supplying capacity
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Creator Debarup Das
Amaresh Kumar Nayak
V. K. Thilagam
Dibyendu Chatterjee
M. Shahid
Rahul Tripathi
S. Mohanty
Anjani Kumar
B. Lal
Priyanka Gautam
B. B. Panda
S. S. Biswas
 
Subject Keywords Fixation capacity . Fixation threshold concentration . Long-term fertilizer experiment . Q/I relationship . Release kinetics . Release threshold concentration
 
Description Not Available
Purpose Potassium (K)-fractions, thresholds of K release and fixation, quantity-intensity (Q/I) parameters of K, K-release
kinetics, and K-fixation capacity were compared for their effectiveness in differentiating the effect of various nutrient management
practices on K supplying capacity of an Aeric Endoaquept soil after 45 years of puddled rice cultivation.
Materials and methods Soil samples (0–15 cm) were collected after the completion of 45 rice-rice cycles from an on-going longterm
fertilizer experiment located in ICAR-National Rice Research Institute, Cuttack, India. The treatments involved control
(unfertilized), N (nitrogen fertilizer), NP (N+ phosphorus fertilizer), NK (N+ potassium fertilizer), NPK (N + P + K fertilizer),
FYM (farmyard manure), N + FYM, NP + FYM, NK + FYM, and NPK + FYM.
Results and discussion Rice cultivation without K fertilizer application resulted in lower values of soil K parameters than the Kfertilized
treatments. Treatment effects were most prominent on release threshold concentration (RTC), followed by cumulativeK
release, K-release rate constants, and K-fixation capacity. Parameters of K-release kinetics and Q/I relationships showed better
correlation with rice grain yields than soil-K fractions. Soil K thresholds were closely related with exchangeable (Kex) and nonexchangeable
K (Knx), but not clay minerals.
Conclusions Among the soil K parameters, RTC, cumulative K release (Kf) with 0.01MCaCl2, release rate constants (bR and bS)
of parabolic diffusion equation, and K-fixation capacity were most effective in revealing the nutrient management induced
variations in soil K fertility. In the studied soil, K-thresholds were significantly related to Kex and Knx.
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Date 2020-06-12T09:34:48Z
2020-06-12T09:34:48Z
2018-01-15
 
Type Research Paper
 
Identifier Not Available
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http://krishi.icar.gov.in/jspui/handle/123456789/37119
 
Language English
 
Relation Not Available;
 
Publisher Not Available