When should samples be taken for plant analysis of corn?

For effective plant analysis in corn, sampling when approximately one-half of the plants are beginning to silk is optimal. At this stage, the plant has reached a critical point in its development that reflects its nutrient status during the critical growth period. The nutrient demands of corn increase significantly as it transitions from vegetative stages to reproductive stages, particularly as it approaches silk initiation.

Taking samples at this time allows for the assessment of nutrient uptake and any potential deficiencies that may affect yield potential. This timing captures the physiological state when nutrient levels are particularly important for setting yield, as it directly correlates with ear development and overall corn production.

Other stages of corn growth, such as early or late vegetative stages, do not provide as accurate a reflection of the plant's nutrient needs during reproductive development. Sampling at complete maturity may also be too late to make any necessary adjustments in nutrient management for that growing season, making it less useful for immediate decision-making regarding crop management practices.