Basic Agricultural Study

Menu
  • Home
  • Agronomy
  • Soil Science
  • Horticulture
  • Crop Botany
  • Entomology
  • Plant Pathology
  • Genetics and Plant Breeding
  • Biochemistry
  • Agri-business and Marketing
  • Agricultural Chemistry
  • Agricultural Extension
  • Ag. Economics
  • Post-harvest Technology
  • Agro-forestry
  • Ag. Statistics
  • Farm Mechanics
  • Job Oriented Course
  • Blog
Home
Soil Science
Basic Role of PH in soil [Nutrient Availability]
Soil Science

Basic Role of PH in soil [Nutrient Availability]

Agriculturist Musa March 5, 2019
Basic Role of PH in soil

Role of PH in soil [Nutrient Availability]

Availability of all nutrient depend on soil PH. Generally macro nutrients with Mo availability increase as soil PH increase. On the other hand, availability of micro nutrient except Mo decreases with the increases of soil PH. This is suitable PH for available of all nutrient is around 6.5 ­ 7.5.   

P availability: These element (p) availability is maximum when soil PH range 6 ­7.5. The availability of P in acid soils (low PH) is hamper due to formation of Fe, Al, Mn phosphate.   

(i)                 Al(OH)3 + H2PO4  →  Al(OH)2-­H2PO4 + OH-­  →  Al(OH)2         

(ii)    Fe(OH)3 + H2PO4  →  Fe(OH)2­­H2PO4 + OH-­  →  Fe(OH)2    P deficiency is very likely in low PH. e.g. Modhupur.          

(iii) P­ fixation occurred in calcareous soil up to 8.5 PH and increases the availability of  P.   

CaCO3 + H2PO4  →  Ca3(PO4)2 + CO2 ↑ + H2O  

Zn availability: Zinc availability is low at high soil PH due to the formation of insoluble Zn(OH)2 or ZnCO3.   

Zn2+ + H2O →  Zn(OH)2+ H+    Zn2+ + CaCO3  →  ZnCO3+ Ca2+

Toxicity of Al, Fe and Mn: In strong acidic soil (PH < 5) toxicity of Al, Fe and Mn may arise. They are more soluble in acidic condition and absorption is more, as a result toxicity arise.   

Microbial activity: Generally bacteria are active in neutral and slightly alkaline soils while fungi are active in acidic soil. So, organic matter decomposition, N2­ fixation and nitrification are tremendously reduce when soil PH below 5.5.    CO(NH2)2 → NH4+ → NO2­   →   NO3

You can read more articles about Soil Science

Useful Agricultural Websites

Online Agricultural Study

Food and Agricultural Organization

United States Department of Agriculture

Share
Tweet
Pinterest
Email
Prev Article
Next Article

Related Articles

Primary minerals vs Secondary minerals
Primary minerals vs Secondary minerals Primary minerals Secondary minerals 1. …

Primary minerals vs Secondary minerals

Particle density vs bulk density
Particle density vs bulk density Particle density Bulk density 1. …

Particle density vs bulk density

About The Author

Agriculturist Musa

Agriculture is the key development in the rise of sedentary human civilization. As an agriculture student, I want to make a positive footprint in the young agriculturist community through this blog.

Leave a Reply Cancel Reply

You must be logged in to post a comment.

Basic Agricultural Study

About

This is a blog is about basic agricultural study. This blog helps those students who are want to achieve proper knowledge of basic agriculture degree B.Sc.Ag (Hons.). Read attentively and make yourself a good agriculturist and work for the nation.

Facebook page

Recent Articles

  • The 3 Basic Causes of Plant Diseases
  • Cucurbitaceae, Gramineae, Solanaceae: Features and importance
  • External Morphology of Tea, Rice, Wheat, Sugarcane
  • Structure of protein
  • Plant Adaptations: Definition and Classification
Copyright © 2021 Basic Agricultural Study

Ad Blocker Detected

Our website is made possible by displaying online advertisements to our visitors. Please consider supporting us by disabling your ad blocker.

Refresh