Experts Urge Timely Wheat Harvest to Combat Heat Stress in Indo-Gangetic Plains
As temperatures soar during March and April, posing a significant threat to wheat productivity across the Eastern Indo-Gangetic Plains, agricultural experts from the International Rice Research Institute South Asia Regional Centre (ISARC) have issued a critical advisory. They are urging farmers to meticulously monitor crop maturity and ensure timely harvesting to minimize losses caused by terminal heat stress.
Understanding Crop Maturity and Optimal Harvesting Conditions
According to the advisory released by ISARC, the grain-filling stage in wheat begins after flowering and continues until physiological maturity, which is typically reached when grain moisture levels are around 37%. After this point, moisture starts to decline gradually. Experts emphasize that while harvesting at full maturity is ideal, the current climatic conditions necessitate adjustments. Specifically, they recommend harvesting when grain moisture is between 18% and 20% to secure yields without incurring significant losses.
Identifying Maturity and Avoiding Delays
Farmers have been advised to identify the right time for harvesting by observing visible signs of maturity. Key indicators include yellowing stems and grains that produce a cracking sound when pressed with teeth but do not break under fingernail pressure. Delayed harvesting can lead to grain shattering and substantial losses, particularly in late-sown crops that often mature prematurely due to excessive heat exposure.
Moisture Management for Procurement and Storage
The advisory also highlights the importance of moisture control post-harvest. Grain moisture above 14% can result in reduced procurement rates or even rejection by buyers. For safe storage, moisture should be maintained between 12% and 14%. Seeds intended for longer storage require even lower moisture levels to preserve germination quality. To mitigate insect damage and maintain seed viability, experts recommend using hermetic or super bags.
Harvesting Techniques and Equipment Recommendations
For manual harvesting, farmers should dry bundles for three to four days before threshing to ensure optimal conditions. However, labor shortages in many regions may delay harvesting and increase losses. In such scenarios, combine harvesters present a more efficient and cost-effective alternative, provided they are operated at appropriate speeds to minimize grain loss during separation and cleaning processes. In lodged crop conditions, farmers should adjust by operating the cutter bar closer to the ground at reduced speeds for better intake.
This comprehensive guidance aims to help farmers navigate the challenges posed by rising temperatures, ensuring better crop management and reduced economic losses in the vital wheat-producing regions of the Indo-Gangetic Plains.
