Lime applied at Full LR, 1.3 LR, 0.7 LR, 0.4 LR as broadcasting and Lime applied at 1/5th LR, 1/10th LR and 1/15th LR as row application.
It is observed that crops grown in acid soils often do not respond to the application of lime when soils contain Ca-zeolite, and lime requirement of acid soils is very low when soils contain gibbsite mineral. Therefore, acidity of soils may not be the only index parameter for recommending lime.You may refer to the section 9.2 of a recent publication attached herewith. With best wishes-D.K.Pal
Dear Dr. Naik,
(1) Frequency of lime application is a function of crop need and soil pH. Several factors work in concert to determine soil pH change after lime application. They include (i) fineness of lime material, (ii) application rate, (iii) degree of mixing, (iv) soil pH, (v) N rate, (vi) irrigation water supply and quality, (vii) residue removal and (viii) crop rotation.
(2) Of all these factors, N rate is the simplest predictor of soil pH decline, and it can be used to estimate when a lime application might be needed. Soil pH declines slightly less than 0.1 unit with the addition of each 100 kg N/ha as urea on most soils. That means within 3 to 5 years (with use of N at this rate), soil pH will decrease by 0.4 to 0.5 unit in the top 5 to 8 cm soil layer. In sandy soil of low CEC, the rate of soil pH decline is about double.
(3) It is important to evaluate lime need regularly, especially when a rotation includes crops that are tolerant to soil acidity (like wheat) followed by crops that are more sensitive to soil acidity (like cauliflower, spinach, garlic, etc).
For more detailed information, I attach herewith PDF copy of a relevant article. Hope you find this input interesting and useful.
Thank you Pal sir and Kundu sir for providing the necessary information.
Dr Naik,
I will highly appreciate if you explain that how can we differentiate Acidic soil through visual or morphological basis (without lab test) or any landmark weeds or insects or pattern which mark in comparison to normal or alkaline soil.
Dear Dr Pandey
We can differentiate the type of soil (Acid, Alkaline and Normal) through soil chemical test. However, acid soil can be visualized without lab test as,
1. It looks red in colour to some extent and not always.
2. Symptoms of termite infestation in crop field.
3. Presence of granite rocks as parent material in the region.
4. signs of Surface crusting, soil compaction and erosion
5. Low water retention capacity.
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