Agricultural Research Management Information System

Home
Research Summary
Search
About Us
- ARMIS
- Brochure
Contact Us
Report
User Request
Data Input
Help
- Operation Manual
  - PDF
  - Video
- Program Area & Commodity
We have reached 37600 number of research entries at this moment.

- Logout

Research Detail

Home
Research
Detail

The Yield Ad Chemical Composition of Soybeans as Affected by There Levels of Complementary Nutrients Associated with Five Levels of Phosphorus

A. Islam
Department of Soil Science, Dhaka University

Abstract/ Executive Summary:

The use of triple supershosphate at rates up to 200 Pounds of Phosphorus Per acre increased the dry weight of both leaves and stems. The Yield of Seed was significantly increased by the 200 Pound application of Phosphorus. The use of rates above this reduced the uptake of Potassium which tended to be reflected in reduced seed yields. Phosphorus levels in both the leaves and the stems increased upto the flowering time and then decreased during the Pod-filling period. Triple superphosphate applied to the soil at the rate of 400 Pounds Per acre of Phosphorus significantly increased the Phosphorus content of the leaves and stems. When less than 400 Pounds, Phosphorus levels in the tissue were not increased greatly but the treatment did contribute to plant growth and yield. The use of triple superphosphate resulted in increased accumulation of the divalent ions, calcium and magnesium. This was associated with a lower concentration of Potassium. Differences in the accumularion of cations by soybeans were attributed to the morphology and Physiology of the roots. The application of Phosphorus increased the total sugar and alpha amino nitrogen contents of soybean plants. Phosphorus is thought to increase the efficiency of carbon dioxide utilization. In addition, this element is essential for phosphorylation reactions which could aid in the formation of alpha amino acids.

Keywords: Soil, Soybean Phosphorus, Chemical composition

Location: Dhaka University, Bangladesh

Start Date:

End Date:

Program Area: Crop-Soil-Water Management

Commodity: Soybean

Objectives:

To determine certain basic relationships which were operative in establishing the variations in plant composition so that the result might value in interpreting data from similar studies in the future.

Methodology:

A field experiment was initiated in 1960 on the Soil Science Farm of Michigan State University on a medium fertile Conover silt loam soil. A total of 17 treatments were used. Each treatment was replicated 3 times. Each plot was 10 feet wide and 25 ft long and contained 4 rows. The fertilizer materials included ammonium nitrate 33.5 percent nitrogen; triple super phosphate, 45% P₂0₅; potassium cirioride, 60 percent K₂0; Calcium hydroxide, 54 percent calcium and magnesium oxide, 60% magnesium. The five phosphorus levels, expressed on elemental basis, including the zero level and rates of application used in this experiment. The phosphorus was accompanied by other nutrients of nitrogen, magnesium, potassium and calcium at what was considered to be "low", "medium", and "high" levels. One half of the fertilizer and lime were broadcast before plowing on May 14 and 15, and the other half after plowing on June 4 and 5. The materials were worked into the top 3 or 4 inches of soil. Plants were selected at random from middle two rows on July 12 when the plants were 13 days old, on August 3 when the plants were 34 days old and on August 30 when the plants were 61 days old. The number of plants harvested from each plot on the different dates were 30, 20 and 10 respectively. The plants were cut off at the ground level. On the second sampling date, 10 plants were frozen immediately after sampling. The soil samples obtained from each plot were air dried and screened through a 2 millimeter sieve. After mixing 200 gm samples of soil from each pot were saved for chemical tests. The pH of each sample was evaluated with a Beckman Potentiometer using 1 to 1 soil water ratio. Available phosphorus was determined. The extracting solution consisted of 0.03 normal ammonium fluoride and 0.025 normal hydrochloric acid. A soil extracting solution ratio of 1 to 8 was used.

Source of Information: Pak. J. Soil Sci. 1(1): 32-49,1964

Article Link (Online Journal):

Funding Source:

1.

Budget:

Total Budget (Tk.) :

Achievement/Findings:

In this research, the use of phosphorus tended to decrease the level of potassium in the plant at the flowering stage. According to Nightingale et al. (1930) and others Potassium is essential for the synthesis of proteins from amino acids. Therefore, this helps to explain the accumulation of amino nitrogen that occurred at this stage of development.

Knowledge Management: Journal