Groundnut variety is TG - 51 (95 days).
Irrigation level = 4 (I-1: Surface Furrow at IW/CPE = 1, I-2, I-3, I-4: Micro-sprinkler with ETc = 100%, 80% and 60%)
Nutrient level = 3 (F-0 : no fertilizers, F-1 : RDF, F-2 : STCR based nutrient dose for 25 q/ha kernel yield + 1 kg/ha B)
Please, suggest parameters/methods/instruments to quantify the growth stage based stress.
Start with a soil analysis before anything else. This will give an idea of how nutrient needs might be addressed.
Foliar analysis can be used to see if your nutrient play is effective. After establishment take your foliar aanalysis every 2 to 3 weeks.
The water needs can be assessed using soil tensiometer to wait to a level of stress before irrigation. The period just before and after flowering is particularly
critical.
Evaporation can be measured to help predict the time of irrgation. Irrigationamount is related to amount of active foliar in the development stages.
When planting your groundnut use a seed inoculant to avoid nitrogen need and also the micronutrient application on seed can be very useful for biological nitrogen fixation. Phosphorus can promote early root development and the critical need for Potassium is in ground nut filling.
I can't comment on the inputs, but sap and foliar analysis will tell you what the plant is seeing
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