What is the best book or guideline for fertilizer recommendations?

Dear all,

I have a question regarding ways to separate ammonium nitrate and phosphorus pentoxide？

I know P fixation in soils depend on many factors. For know there are general data sets for the % P fixation in relation to pH. I was wondering if there is something like this bu in retation to soil type.

Micro and macro plant nutrient are crucial for plant's especially crops' growth, development and yields. Excessive use of synthetic fertilizer increase crops vulnerability to disease & pests. on the contrary it create lower use retarded growth. Both case result lower yields, degrades soils, increase GHG emissions. It is not possible to analyze soils for identification of plant demand of fertilizer. Some sensor are working well in this connection but huge cost, technological knowledge gap and management problem associated with it. If it is possible to measure crops demand for synthetic fertilizer remotely using hyperspectral imagery, would be easy and efficient technique. Is it possible?

How do soil microflora respond to different soil management practices, such as tillage, fertilization, and irrigation?

These often-overlooked gems hold the key to diverse and resilient food systems. We're talking about peculiar growth habits, susceptibility to pests and diseases, and often, a complete lack of tailored agricultural practices. To kickstart the conversation, I'd like to highlight the case of Ragi (finger millet) in India. While it's a nutritional powerhouse, its cultivation faces challenges like low yields, susceptibility to pests, and limited market demand. What are your thoughts on these or other orphan crops in your region?

I used humic acid at 0.044 g/kg soil in my pot experiment. But finally, I have to recommend kg/ha. Each pot's soil weight was 11 kg.

What is the solution?

Farmers no longer have to apply water, fertilizers, and pesticides uniformly across entire fields. Instead, they can use the minimum quantities required and target very specific areas, or even treat individual plants differently. Benefits include: Higher crop productivity.