(function(){ // Only calculate if the button was pressed // DEBUG: show that button was pressed var debugBox = "Button pressed!
"; // Ensure all fields are filled if (!fieldname4 || !fieldname3) return "Please fill in all fields before calculating."; var CROP_OPTIMA = { "strawberry": {leaf: 8.0, root: 6.0}, "pepper": {leaf: 8.0, root: 8.0}, "tomato": {leaf: 6.0, root: 8.0}, "cucumber": {leaf: 7.0, root: 8.0}, "leek": {leaf: 6.0, root: 6.0}, "aubergine/eggplant": {leaf: 7.5, root: 9.5}, "lettuce": {leaf: 5.0, root: 7.0}, "blueberry": {leaf: 8.0, root:10.0}, "blackberry": {leaf: 9, root: 10.0}, "watermelon": {leaf: 9.0, root: 9.5}, "cut flowers": {leaf: 7.5, root: 9.0}, "zuchini": {leaf: 7.5, root: 9.0}, "courgette": {leaf: 7.5, root: 9.0}, "apples": {leaf: 10.0, root: 10.5}, "pears": {leaf: 9.5, root: 10.0} }; var crop = fieldname2.toLowerCase().trim(); var leafBrix = parseFloat(fieldname3) || 0; var rootBrix = parseFloat(fieldname4) || 0; if (!CROP_OPTIMA[crop]) return "Invalid crop selected."; var leafOpt = CROP_OPTIMA[crop].leaf; var rootOpt = CROP_OPTIMA[crop].root; var leafNorm = MIN(leafBrix / leafOpt, 1); var rootNorm = MIN(rootBrix / rootOpt, 1); var ratio = rootNorm === 0 ? NaN : leafNorm / rootNorm; var gap = (leafNorm - rootNorm) * 100; var advice = []; if (leafNorm < 0.70) advice.push("Low leaf-Brix → sugars not accumulating in leaves; check N, light, irrigation, Ca/Mg/trace balance.
"); if (rootNorm < 0.70) advice.push("Low root-Brix → roots under-energized; check drainage, oxygen, EC, Na, Cl.
"); if (ratio >= 1.25) advice.push("Leaf ≫ Root → source–sink mismatch or root stress.
"); if (ratio <= 0.80) advice.push("Root ≫ Leaf → strong vegetative push; monitor for softer tissues or pests.
"); var gapText = "Leaf–Root gap: " + Math.round(gap) + "% points (positive = Leaf ≫ Root)
"; var adviceText = "Advice: " + (advice.length ? advice.join("") : "No specific issues flagged; monitor trend and maintain balance."); return gapText + adviceText; })();