Rice (Oryza sativa)
Temperature parameters at different growth phases.
- Flowering and fertilization 16 - 20oC
- Ripening stage 18 - 32oC.
- Temperature beyond 35oC affects grain filling.
Soil
- Good performance in different soil types.
- pH range for normal growth 5.0 - 8.0
- Grown as both transplanted or direct sown crop
- Seasons: 3 seasons namely, Viruppu, Mundakan, Puncha.
Different rice growing seasons of Kerala
During second crop, in Palakkad district, where irrigation is assured, for higher yield in photosensitive high yielding varieties, the crop commencement may be adjusted in such a way that it flowers only during the second fortnight of December, facilitating proper integration with the weather, better utilization of applied fertilizers and high filling percentage.
| Agroclimatic situations | Seasons | Period | |
|---|---|---|---|
| From | To | ||
| General | |||
| Virippu (Ist crop/autumn) | April-May | Sept-Oct | |
| Mundakan (IInd crop/winter) | Sept-Oct | Dec-Jan | |
| Puncha (IIIrd crop/summer) | Dec-Jan | Mar-Apr | |
| Onattukara | |||
| Virippu (Ist crop/autumn) | April | August | |
| Mundakan (IInd crop/winter) | Aug-Sep | Dec-Jan | |
| 3rd crop (where HYVs come up) | Feb-Mar | April | |
| Kuttanad | |||
| Additional Crop | May-June | Aug-Sep | |
| Puncha | Oct-Nov | Feb-Mar | |
| Kari Soils | Additional Crop | Jun-July | Sep-Oct |
| Kole (Single cropped area) | Mundakan (Kadumkrishi) | Aug-Sept | Dec-Jan |
| Pokkali | |||
| Virippu (Ist crop/autumn) | May-June | Sept-Oct | |
| Oorumundakan | Aug-Sept | Dec-Jan | |
| Kaipad | Virippu (Ist crop/autumn) | April-May | Sept-Oct |
| High range | |||
| Nancha | May-June | Oct-Nov | |
| Puncha | Dec-Jan | Apr-May | |
