I want to use surveyed data of fertilizers used by farmers for sugarcane to identify/estimate NET salt load being added on the soil every year.
I have following queries
1. Is there any generic chemical formula of fertilizers which can lead to total contents of ions Like Na, Ca. Mg, SO4, Cl combined getting added to soil. ?
2. By the usual practices of fertilizers spread by hand, some amount stays unused. Hence how much NET salts we can assume are getting added in soils after consumption by plants.?
3 What are possible reactions of these fertilizers with soils, so that I can deduce amount of cation, and anion getting added in soil increasing salinity.
Can u share/refer some reading material or excel formula sheets which can answer above?
I really appreciate your help
The use of irrigation minus fertilizers have some impact on soil salinity and sodicity. If you factor in the combine effects on irrigation (condition on which kind, sprinklers, drip, etc) and inorganic fertilizers, the salinity spectrum becomes even worst considering also the evapotranspiration process (evaporation from soil surface and transpiration from leaves) leave excess salt concentrates at the root zone and in the leaves of plants. If you factor in irrigation water quality (specifically the salt content) prior to irrigation, you will then understand that the issue of evaluating salinity is not just a factor of fertilizer application (which could be the main culprit),. but not mutually exclusive of the evapoconcentration process.
Here are few great resources that I am also currently using:
Allen, R. G., L. S. Pereira, D. Raes, and M. Smith. 1998. Crop Evapotranspiration- Guidelines for Computing Crop Water Requirements: FAO Irrigation and Drainage Paper 56. FAO, Rome, Italy.
Ayers, R. S. and D. W. Westcot. 1976. Water Quality for Agriculture. FAO, Rome, Italy.
Fipps, G. 2003. Irrigation Water Quality Standards and Salinity Management Strategies. Agricultural Communications at the Texas A&M University System, Houston, TX. U.S.A.
Hanson, B. R., S. R. Grattan, and A. Fulton. 2006. Agricultural Salinity and Drainage. Water Management Series Publication:1-180.
Nyvall, J. 2004. Sprinkler Irrigation Scheduling Using A Water Budget Method. Pages 1-7 in M. o. A. Bristish Columbia, Food and Fisheries, editor. http://www.agf.gov.bc.ca/resmgmt/publist/500Series/577100-3.pdf,
Provin, T. and J. L. Pitt. 2012. Managing Soil Salinity. Pages 1-5 in T. A. M. A. Extension, editor. Texas A&M AgriLife Extension.
Suarez, D. L. 2012. Irrigation Water Quality Assessments. Pages 343-370 Agricultural Salinity Assessment and Management. ASCE Manual and Reports on Engineering Practice, Reston, VA.
Thank you sir. It is a good starting point.
I do have Fertilizers DATA regarding the type and consumption of fertilizers being consumed in sub district levels. What I need is detailed chemical formula formula for various fertilizers. Eg. 10-10-5 indicates N P K, right where as last 5 is % of K in terms of K2O (expressed as K2O), but not necessarily containing K2O. Also What I am interested is along with NPK elements, it must have Ca, Mg, SO4 etc compositions. How they can be generally determined/assumed.
@Eyal
That's what I was needing. I will check out MSU site for some data.
Thanks
You may go through text books on soil science, manures and fertilizers for getting idea on types of fertilizers, nutrient content, chemical forms and composition, their nature, how to apply etc.
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