Quantity-intensity characteristics of Potassium (K) in relation to potassium availability under different cropping system in alluvial soils

Abstract

Potassium availability to the plant is influenced by internal soil properties and other external properties. Quantity intensity characteristics are one of the satisfactory measures of potassium dynamics and its availability. So quantity intensity characteristics of potassium were studied to quantify the potassium availability in three different cropping systems viz., paddy-paddy, banana and paddy-pulse based. Three soil profiles were studied in each cropping system and soil samples were collected horizon wise for laboratory analysis. Q/I parameters were estimated by the method adopted by Beckett (1964a). Analysis of variance was performed to compare the impact of cropping system and pedons on different chemical and nutrient properties of soils. Significantly high organic carbon (0.47%) and available nitrogen (271.10 kg/ha), medium available phosphorus (17.00 kg/ha) and available potassium (230.50 kg/ha) recorded in paddy-pulse cropping system compared with other cropping system. Banana based cropping system recorded significantly higher clay (41.2%), soil reaction (8.24) and potassium fixing capacity (84.32%). The results of Quantity-Intensity (Q/I) dynamics studies shows that paddy-pulse based cropping system recorded high labile K K L (0.49 c mol (p+)/kg) and Potential buffering capacity PBC K (45.67 c mol (p+)/kg) whereas paddy-paddy cropping system recorded PBC K of 16.81 c mol (p+)/kg which needs frequent potassium fertilization. The results showed that most of the soil properties including K dynamics were greater extent influenced by changes in cropping systems which consecutively affects the potassium availability.

Potassium Mobility Potential of Forest Soil In Kurdistan Region, Iraq, As Estimated By Quantity- Intensity (Q/I) Relationships

“…Various interpretations of parameters AR K e, ΔK0, PBC K , and KX have been made, which can be derived from a Q/I plot (LeRoux and Sumner, 1968). The slope of ∆Q/∆I measures the amount of labile K that can be removed before ARe K falls by more than a given amount that is a gradient of the linear part of the graph has generally been representing Potential BufferingCapacity (PBC K ) of the soil (Lalitha and Dhakshinamoorthy, 2015).…”

Evaluation of Potassium Quantity-Intensity in some Soils of El-Dakhla Oasis, New Valley, Egypt

“…Also, the high values of labile K due to a greater K release into the soil solution, resulted in an increase in availability of K. Also, K fertilizer may be increase the labile K in the soil (Yawson et al, 2011). On the other hand, the lowest labile K value of soil 4 (0.020 cmol kg -1 ) was due to the more retention of K because of the presence of montmorillonite clay mineral (Lalitha and Dhakshinamoorthy, 2015). In generall , most of the potassium added through mineral fertilizer or released from organic amendments in the calcareous or sandy soils (soil 4) are susceptible to leaching due to their lower CEC or clay content compared to high clay content in soil 1, that maintains a great amount of K on the clay exchange sites.…”

“…Quantity-Intensity (Q/I) Parameters Equilibrium activity ratio of potassium (AR (Schneider, 1997). Sparks and Liebhardt, (1981) ) represents the available amount of K capable of ion exchange during the equilibrium between soil solids and solution (Lalitha and Dhakshinamoorthy, 2015). It has to maintain a balance between K on the soil colloids and K in soil solution by ionic exchange.…”

Chemical properties of the soil fertilized with potassium and calcium in guava cultivation cv. 'Paluma'

“…The availability of K can be influenced by internal or external factors, such as the concentration in the medium and external as a stimulus or inhibition to the assimilation by plants (Lalitha and Dhakshinamoorthy, 2015). Therefore, the monitoring of soil fertility in guava orchards should be a systematic practice, especially with respect to the K, which among the macronutrients is the most exported with the fruit harvest (Souza et al, 2014).…”