Plan crop rotation sequences, calculate planting areas, and schedule planting/harvest dates for sustainable farming.
Plan crop rotation sequences, calculate planting areas, and schedule planting/harvest dates for sustainable farming. Input total farm area, rotation system, crop area ratios, and starting year. Get crop areas, planting/harvest schedules, and system benefits. Rotation improves soil, reduces pests, and spreads risk.
You grew corn continuously on the same 50-hectare field for 5 years. By year 3, corn rootworm resistance required two insecticide applications per year. By year 5, soil organic matter had dropped from 3.5% to 2.2%, and yields declined from 10 t/ha to 7.5 t/ha. You switched to a corn-soybean-wheat rotation. In year 1 of rotation, corn yield jumped back to 9.5 t/ha with zero insecticide — the "rotation effect" (break in pest cycle + improved soil) added 2 t/ha. Over 5 years, the rotation system generated $120/ha/year more net profit than continuous corn, despite lower corn acreage. Rotation is not just "good for the soil" — it is more profitable.
Enter total farm area in hectares, select rotation length (3, 4, or 5 years), and choose crops for each year of the rotation (from common options: corn, soybeans, wheat, oats, alfalfa, cover crops, vegetables). Click calculate to see area allocated to each crop per year, total area per crop over the rotation, and planting/harvest windows.
The crop rotation planner helps you design a sustainable crop rotation sequence that maintains soil fertility, reduces pest and disease pressure, and optimizes land use. It calculates area allocation for each crop in the rotation and provides planting/harvest timing guidance. Proper crop rotation is a foundation of sustainable and organic farming.
A: Crop rotation: breaks pest and disease cycles (many pests are crop-specific — rotating to a non-host crop reduces their populations), improves soil fertility (legumes fix nitrogen for subsequent crops; deep-rooted crops bring up nutrients from subsoil), reduces soil erosion (different rooting structures and residue cover), improves soil structure (varying root depths and organic matter inputs), reduces weed pressure (different crops compete differently with weeds, and rotation allows different herbicide modes of action), spreads labor and risk across different crops/planting/harvest times, and can increase overall farm profitability. Monocropping (same crop every year) leads to: declining soil fertility, increasing pest/disease pressure, herbicide-resistant weeds, and eventually declining yields.
A: Classic rotations: Corn-Soybean (2-year, common in US Corn Belt — soybean fixes N for corn, but limited diversity). Corn-Soybean-Wheat (3-year, adds diversity and a small grain). Corn-Oats-Alfalfa-Alfalfa (4-year, alfalfa provides 2 years of N and soil improvement). Wheat-Canola-Peas-Barley (4-year, Canadian prairies). Vegetable rotations: Tomato-Beans-Lettuce-Corn (4-year, avoids same-family crops in consecutive years). General principles: don't plant crops from the same family (Solanaceae: tomato/potato/pepper; Brassicaceae: cabbage/mustard; Poaceae: corn/wheat; Fabaceae: beans/peas) in consecutive years; follow heavy feeders (corn, tomatoes) with light feeders or legumes; include cover crops in fallow periods; and match rotation to your climate, soil, and market. Longer rotations (4+ years) generally provide better pest suppression and soil health than short rotations.
A: Cover crops (also called green manure) are planted between cash crops or during fallow periods, then terminated and incorporated into the soil. They are not harvested for sale. Benefits: prevent soil erosion (roots hold soil, canopy protects from rain), add organic matter (improves soil structure and water-holding capacity), fix nitrogen (leguminous cover crops like clover, vetch, peas add 50-200 kg N/ha), suppress weeds (competition and allelopathy), scavenge nutrients (deep-rooted covers like radish, rye capture leftover N and other nutrients, preventing leaching), and provide habitat for beneficial insects. Common cover crops: cereal rye, oats, winter wheat, hairy vetch, crimson clover, Austrian winter peas, forage radish, buckwheat. Plant cover crops immediately after cash crop harvest, terminate 2-3 weeks before planting the next cash crop (by mowing, rolling, or herbicide). In short growing seasons, use fast-growing covers (oats, buckwheat) or interseed covers into standing cash crops.