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Effect of Lime and Phosphorus on Soil Ph, Available P in Soil and Yield of Wheat in Acid Soil of Dinajpur

M. A. Rahman
wheat Research Centre, Bangladesh Agricultural Research Institute, Dinajpur,

M. Bodruzzaman
Wheat Research Centre, Bangladesh Agricultural Research Institute

A. J M S. Karim
Bangabandhu Sheikh Mujibur Rahman Agricultural University, Gazipur

M. A Razzaque
Wheat Research Centre, Bangladesh Agricultural Research Institute

C. A. Meisner
CIMMYT-Bangladesh, Uttara, Dhaka.

Abstract/ Executive Summary:

In acid soil of Dinajpur, 4 levels of lime (0, 1, 2 and 3 ton/ha) and 5 levels of P (0, 40, 60, 80 and 100 kg P₂0₅/ha from TSP) were tested on soli pH, phosphorus (P) availability and yield of wheat. Application of lime Increased the pH of the soil at crown root Initiation (CRI) stage of the crop and that Increment In pH was nearly stable up to the harvest of the crop. Available P In the surface and sub-surface soil was significantly increased by both liming and application of P. The amelioration effect of acid soil following lime and P application increased significantly the grain yield of wheat, which was associated with increased In number of grain/spike and 1000 grain weight of wheat. Without liming the yield increase In wheat was linear due to applied phosphorus from 0 to 100 kg P₂0₅/ha but when lime was applied at the rate 2 t/ha, higher yield was obtained with application of 80 kg style="margin-left:6.45pt;" P20₅/ha

Keywords: Liming, Phosphorus , Soli pH, Wheat yield

Location: Dinajpur

Start Date: 25-11-1995

End Date: 03-03-1996

Program Area: Crop-Soil-Water Management

Commodity: Wheat

Objectives:

To find out the optimum rates of lime and phosphorus for maximum yield of wheat and ii) study the availability of P and change in soil pH due to application of lime and P.

Methodology:

The experiment was initiated in 1995-96 wheat season at the research field of Wheat Research Centre, Diajpur. There were 4 levels of lime 0, 1, 2, 3 ton/ha and 100 kg/ha from TSP. Nitrogen, potassium and sulphur were applied from urea, muriate of potash and gypsum at the rate of 100, 40 and 20 kg/ha respectively. All fertilizer including two-third urea. were applied at final land preparation and the rest one-third urea was top dressed at CRI stage. Different levels of lime and P fertilizer were arranged in 4X5 factorial RCB design with three replication having unit plot size of 5m X 4m. Liming was done with commonly used liming material calcite (CaC0₃) dust. Mixing and incorporation of lime into the soil in individual plots were done by spading. The experimental soil was acidic having average value of pH 5.1 at the surface (0-10 em) 5.5 at the subsurface (15-30 em). The soil was sandy-loam in texture and very poor in organic matter having organic carbon 0.18% the surface and 0.09% in the sub surface respectively. Exchangeable Ca, Mg contents were 2.7, 0.6 meq/100g at the surface and 3.3, 0.9 meq/100g at the sub-surface. Available P of initial soil was 13 and 12 j.Jg/ml at the surface and sub-surface respectively. The collected data were analyzed statistically as factorial RCB design and the means were separated by Least Significant Difference (LSD) test at 5% level of significance.

Source of Information: Ann. Bangladesh Agric. I0 (2): 125-131, 2000

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

Liming increased the soil pH both at surface (0-15 em) and sub surface (15-30 em) as determined at CRI stage and after harvest of wheat. Soil pH was raised from 5.2 to 6.5 in surface and from 5.4 to 6.4 in sub-surface at CRI stage of the crop due to application of lime.Both at CRt stage and after harvest of the crop, available P of soil tended to increase with each increment of lime and applied P levels. Due to liming, the maximum average value of available P was recorded from L₃ at different depths of soil and stages of the crop which were statistically similar to L₂ but different from LO and L₁_. At the same level of PO grain yield of wheat increased by 33.3 % (from 2841 to 3788 kg/ha) due to application of lime at the rate of 3 t/ha but the increment was 12.8 % with the same amount of lime under P₄. Again, under no liming grain yield of wheat was increased. by 39.8 % (from 2841 kg/ha in PO and 3971 kg/ha in P₄) due to application of P₂0₅ at the rate of align="center" style="margin-left:8.35pt;"> 100 kg/ha but the increment was about 18.3 % with the same amount of P₂0₅ under L3. Application of lime in the absence of applied P and application of P in the absence of lime exhibited a greater response as compared to application of both at higher rate. However, the highest grain yield (4591 kg/ha) was obtained from L₃P₃, which was similar to the that obtained from liming at the rate of 2 t/ha coupled with P₂0₅ 60 kg/ha (4568 kg/ha). From the above results and information it may be concluded that liming at the rate of 2 t/ha coupled with 60 kg P₂0₅/ha improved both yield and chemical properties (pH, available P) of acid soil

Knowledge Management: Journal