An Asian Journal of Soil Science

Partha Sarathi Patra ¹, Shyamal Kheroar ², Ashok Choudhury ³, Rajesh Saha ⁴

Affiliations
1 Regional Research Station (U.B.K.V.), Terai Zone, Cooch, Behar (W.B.), IN
2 All India Network Project on Jute and Allied Fibres, Uttar Banga Krishi Viswavidyalaya, Pundibari, Cooch, Behar (W.B.), IN
3 Department of Soil Science and Agricultural Chemistry, Uttar Banga Krishi Viswavidyalaya, Pundibari, Cooch, Behar (W.B.), IN
4 Department of Agronomy, Uttar Banga Krishi Viswavidyalaya, Pundibari, Cooch, Behar (W.B.), IN

Abstract

A field trial had been conducted to see the responses of split application of nitrogen on the performance of Kharif rice comprising of 5 treatments (T₁=50% N as basal+50% N at active tillering, T₂=50% N as basal+25% N at active tillering+25% N at panicle initiation, T₃=25% N as basal+25 % N at active tillering+25% N at panicle initiation+25% N at flowering, T₄=40% N as basal+30% N at active tillering basal+30% N at panicle initiation and T₁=100% N as basal) using Randomized Complete Block Design (RCBD) with 4 replications in Terai zone, Cooch Behar, West Bengal during 2015 and 2016. The experimental results showed that all the growth and yield attributes were found to be highest where nitrogen was applied in four equal split (T₃) followed by T₂ and T₄. Higher growth and yield attributes ultimately helped in producing 6.98 and 9.22 per cent more grain yield in T₃ over T₂ and T₄, respectively. 430 to 820 kg ha^-1 yield reduction has been found when 100 per cent nitrogen applied as basal in comparison with splitting of nitrogen in two (T₁) and four equal parts (T₃).

Keywords

Rice, Nitrogen, Split Application, Yield, Economics.

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Amrit Tamang ¹, Partha Sarathi Patra ², Parimal Panda ³, Manoj Kanti Debnath ⁴, Gobinda Mula ⁵, Ranjan Kumar Basak ⁶

Affiliations
1 Department of Soil Science and Agricultural Chemistry, Uttar Banga Krishi Viswavidyalya, Pundibari, Cooch Behar (W.B.), IN
2 Regional Research Station (UBKV), Terai Zone (W.B.), IN
3 Department of Soil Science and Agricultural Chemistry, Faculty of Agriculture, Uttar Banga Krishi Viswavidyalya, Pundibari, Cooch Behar (W.B.), IN
4 Department of Agricultural Statistics, tar Banga Krishi Viswavidyalya, Pundibari, Cooch Behar (W.B.), IN
5 Department of Agricultural Economics, Uttar Banga Krishi Viswavidyalya, Pundibari, Cooch Behar (W.B.), IN
6 Department of Agricultural Chemistry and Soil Science, Bidhan Chandra Krishi Viswavidyalaya, Mohanpur (W.B.), IN

Abstract

Numerous standard methods are already exist for determining soil organic carbon and each method has its own advantages and disadvantages. In present study we tried to develop a “modified colour matching method” that is rapid, reliable, user-friendly, safe, time-efficient and economical for determinations of oxidizable organic carbon (OOC) in agricultural soils. Analysis of OOC of 136 numbers of soil samples were determined by ‘Walkley and Black wet oxidation method’ (Walkley and Black, 1934) and ‘Modified colour matching method’. In the proposed method soil organic carbon is determined using 2.5 ml potassium dichromate solution with 2 ml (1.25:1) concentrated sulphuric acid. The data obtained by using the proposed method correlated strongly with the data obtained by wet oxidation Walkley and Black method. New modification safeguards the objectivity of results; since it gives the mean value of Z-test for two samples were 0.190 which is non-significant at 5% level of significance. The OOC value of a given soil sample determined by two methods did not differ largely. Maximum difference was 0.32 units and 2.9% of the total sample had no difference. In fact, 45.6, 27.2, 18.4, 3.7 and 2.2% of total sample showed the differences of 0.01-0.05, 0.06- 0.10, 0.11-0.15, 0.16-0.20 and >0.2 units, respectively. This method not only reduces the cost but it can be sufficed at remote places where soil testing laboratory are not available so, it can be easily accommodated in soil testing kit.

Keywords

Oxidizable Organic Carbon, Colour Matching Method, Soil Testing Kit, Cost Efficient.

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