![]() ![]() "A uniform decimal code for growth stages of crops and weeds". University of Kentucky College of Agriculture. A Comprehensive Guide to Wheat Management in Kentucky. Archived from the original (PDF) on 25 November 2011. "Growth Stages of Wheat: Identification and Understanding Improve Crop Management" (PDF). ^ Wise K, Johnson B, Mansfield C, Krupke C."GROWTH STAGES IN CEREALS ILLUSTRATION OF THE FEEKES SCALE". Verslagen van de Technische Tarwe Commissie. Kernel hard (no longer dented with thumbnail) Kernel hard (difficult to divide with thumbnail) Z30: ear is one centimeter long in wheat.Knowing the growth stage of the crop when checking for problems is essential for deciding which control measures should be followed. ![]() The crop is also more sensitive to heat or frost at some stages than others (for example, during the meiosis stage the crop is very sensitive to low temperature). Disease control is most critical in the stem extension and heading stage (Z31, Z32, Z35), in particular as soon as the flag leaf is out (Z37). Wheat growth regulators are typically applied at Z30. In France, the recommendation for the first nitrogen application on wheat is 6 weeks before Z30, with the second application on Z30. For example, in some countries, nitrogen and herbicide applications must be completed during the tillering stage. They are represented on a scale from 10 to 92. Knowing the stages of development of a crop is critical in many management decisions that growers make. The Zadoks scale is a cereal development scale proposed by the Dutch phytopathologist Jan Zadoks that is widely used in cereal research and agriculture. Kernel hard (difficult to divide with thumbnail). Mealy ripe contents of kernel soft but dry. Three-quarters of heading process completed. One-quarter of heading process completed. Sheath of flag leaf completely grown out ear swollen but not yet visible. Second node of stem formed next-to-last leaf just visible.įlag leaf (last leaf) visible but still rolled up ear beginning to swell. Pseudo-stem (formed by sheaths of leaves) strongly erected.įirst node of stem visible at base of shoot. In some varieties of winter wheat, plant may be "creeping," or prostrate.īeginning of the erection of the pseudo-stem leaf sheaths beginning to lengthen. Tillers formed leaves often twisted spirally. One shoot (number of leaves can be added), first leaf through coleoptile.īeginning of tillering main shoot and one tiller. Like other scales of crop development, the Feekes scale is useful in planning management strategies that incorporate plant growth information for the use of pesticides and fertilizers to avoid damaging the crop and/or maximize crop yield.Ĭereal growth stages using the Feekes scale This scale is more widely used in the United States than other similar and more descriptive scales such as the Zadoks scale or the BBCH scale. The Feekes scale is a system to identify the growth and development of cereal crops introduced by the Dutch agronomists Willem Feekes (1907-1979) in 1941.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |