Range Effect: The Residual Effect of Every Fertilizer and Spray, Day by Day
Every bag of fertilizer and every spray keeps working for a while, then fades. That fading is its residual effect, and it decides whether your crop is covered on the days that matter. Range Effect, a calendar on the anee.io Activities board, draws that residual effect for everything on your plan. It goes lot by lot and day by day, against how critical each day is for your crop.
Why the residual effect matters
Two farmers can spread the same three bags of urea and get very different harvests. The difference is timing. Urea thrown into the floodwater of a rice paddy feeds the crop for about two to three weeks. Then the crop has taken it up or the water has lost it. So if that window closes just before panicle initiation, the crop runs short at the stage that sets the number of grains.
Sprays work the same way. A contact insecticide guards the leaves for about a week, but a systemic one can hold for two. That is why a spray plan that looks full on paper can still leave the crop unguarded when a pest hits hardest.
How the residual effect calendar works
Open it from your board
On the Activities board of your season, tap Range Effect. On a phone it is the calendar icon next to Harvest.
Pick a lot and what to check
Choose the lot, then nitrogen, phosphorus, potassium, a micronutrient such as zinc or boron, a kind of threat such as insects, fungal diseases or weeds, or one named pest of your crop. Pick several to see them side by side, each in its own lane over the same days.
Read the calendar
Each day of the season fills up to how much is still working that day, in the colour of what the product is doing. Dots show how critical the day is for the crop's stage. Red days are gaps: critical, and nothing is covering them.
Try a product before you buy it
Search our book of over 7,000 products sold in the Philippines, say whether you spread it on the soil or spray it on the leaves, pick a date, and see what that product would add to the calendar.
What it reads from your season
Range Effect counts the products you wrote on each day's tasks, from your shed or typed in, on the day you use them. It reads each fertilizer the way the NPK Plus calculator does. So a bag of complete 14 14 14 counts its nitrogen, phosphorus and potassium per hectare of your lot. For sprays it reads the active ingredients, then how long each one keeps working in hot, rainy fields.
The life of one application, in colour
Every product goes through the same stages, and the calendar colours each day by the stage it is in. Urea spread on a rice field first sits in the soil for two or three days, turning into ammonium. Then the roots take it up, it feeds at its strongest, eases off, and fades away. A leaf spray skips the soil, and manure stays in it for a week or more.
Brown means on its way, teal taken in, deep green strongest, pale green fading.
How critical each day is
The calendar follows your lot's own day count and the growth stages of your crop. In palay, nitrogen is critical at tillering and at panicle initiation. After flowering the crop barely takes it up, and it only feeds disease. So nitrogen still working that late shows as late, not as covered.
For pests and diseases, a red day means no protection is working while the crop is at risk. Scout the field first, and spray only when you find the pest. Always follow the product label and its FPA registration.
How much, and how it all connects
Range Effect also weighs how much. It counts the field's need the way the NPK Plus calculator does, for your crop, variety and soil, then shows day by day what your products give against what the crop takes.
Your soil and your products connect too. Sandy soil washes nitrogen down sooner, ammonium fertilizers free some zinc on a high pH soil and calcium on a sodic one, heavy potassium crowds out magnesium, and a leaf spray only tops the crop up. The calendar also marks the days nitrogen runs lush, when blast and hoppers find the crop easy.
Each part can be switched off. The numbers come from our books, your answers about the lot, or the area's typical soil. A soil test and the label come first.
When a product is not in the book
Type its name, its active ingredient, or both. Anee, your smart farm technician, looks it up for a few credits: the maker, the active ingredients and how long each keeps working. We keep what she finds, so the next farmer who names that product finds it at once.
Sign up, choose Libre plus Anee or a bigger plan, and open Range Effect on your season's board.
Get startedHow Range Effect helps you and your farm
- No hidden gaps. See the days your crop is critical and nothing is covering it, before the yield is lost.
- No wasted bags. Fertilizer still working when the crop no longer takes it up is marked, so the next split goes where it counts.
- Sprays timed to the risk. Know how long each spray guards the crop, and when the next one is really due.
- Try before you buy. See what a product would add on the date you plan, then save the reading to compare.
