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Relationship Between Chemically Available Phosphorus and Yield Response

M. O. GHANI
Department of Soil Science, Dhaka University, Dhaka, Bangladesh

Aminul Islam
Department of Soil Science, Dhaka University, Dhaka, Bangladesh

Abstract/ Executive Summary:

Superphosphate applied alone has considerably depressed the yield contrary to expectations. The increase obtained from superphosphate in combination with farm yard manure seems to be due to farm yard manure. Lime in conjunction with superphosphate has shown only a small increase in yield. Acetic acid and combination of 8 (OH) quinoline with selenious acid do not show any appreciable correlation with crop yield. The selenious acid method also does not reveal any significant correlation. Troug's method seems to give the best correlation of all the methods.

Keywords: Phosphorus,Yield response, Rice

Location: Dhaka University, Bangladesh

Start Date:

End Date:

Program Area: Crop-Soil-Water Management

Commodity: Soil fertility

Objectives:

To find out the degree of correlation if any of available phosphorus as determined by the methods using: (i) 0.5 N. acetic acid, (ii) 8(OH) quinoline-acetic acid, (iii) Selenious acid-acetic acid, (iv) 8 (OH) quinoline-selenious acid-acetic acid, (v) Truog's reagent.

Methodology:

Soil samples were taken from the plots of the North Haji Lane Experimental Area, located at the East Bengal Government Agricultural Farm. The soil is a clay loam of the lateritic group. The experiment was laid out in 1948 for studying the residual effect of phosphorus on paddy crops. The carriers of phosphorus used were superphosphate and bone meal. Superphosphate was again combined with lime and cow dung, and bone meal with cow dung alone. The rate of application of superphosphate and bone metal were equivalant to 50 Ibs. P₂0₅ per acre and farm yard manure corresponded to an application of 40 1bs of N per acre. Lime was applied at the rate 40 Ibs. CaC0₃per acre. Three plots receiving sulphate, mustard cake and cow dung at the rate of 40 Ibs. of N Per acre were also included in the study. The Plots received the above treatments annually for eight years upto 1955 and the average annual yields of plots were Obtained (average of 4 replicates). The treatments are shown below. 1. Control 9. Superphosphate, 2. Bone meal. 30. Superphosphate+ Farm Yard manure, 5. Bone meal +Farrn Yard manure, 6. Superphosphate + Lime, 7. Superphosphate + Farm Yard manure + Lime, 8. Ammonium sulphate, 9. Mustard cake, 10. Farm Yard manure. Soil samples were taken from Plots to a depth of 6 inches. Subsoil samples at 6 to 12 inches and 12 to 18 inches were also taken. The data for the surface samples only have been used in the correlation study. Tire annual crop yields (paddy) of the plots in maunds per acre. In view of the facts that the yield figures have shown considerable fluctuation from from year to year in almost all the treatments, in this study the average yield of 8 years for various treatments have been used for the correlation study with the chemical methods.

Source of Information: Pak J. BioI. & Ag. Sc. 1(1): 22-28,1957

Article Link (Online Journal):

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

Lime in conjunction with superphosphate has shown only a small increase in yield. Acetic acid and combination of 8 (OH) quinoline with selenious acid do not show any appreciable correlation with crop yield. The selenious acid method also does not reveal any significant correlation. Troug's method seems to give the best correlation of all the methods.

Knowledge Management: Journal