Effect of time of application on nitrogen uptake, partitioning, and remobilization in walnut trees

Agro‐economic and ecological assessment of poultry abattoir sludge as bio‐nutrient source for walnut plantation in low‐fertility soil

“…The greatest increase in annual stem volumes was obtained in the second and the third growing seasons, especially in the trees amended with high PAS doses ( T 3 and T 4 ). It has been reported that the annual primary growth rate of walnut depends accumulated nutrients in plant tissues the in previous year . Comparing to the fertilizer control ( T 0 ), similar or stronger plant growth measured in PAS applications from T 2 to T 4 can be explained by the accumulation of nutrients in favorable soil conditions with the presence of additional nutrients in the OM, acting as a slow‐release fertilizer during the whole vegetation season .…”

“…Likewise, Bravo et al . stated the walnut tree requires a relatively high amount of nitrogen and application time influence the nitrogen use efficiency. Assuming the slow‐release characteristics of waste originated nutrients , PAS application could optimize the nutrient use efficiency and growth of fruit tree as well as help environmental protection sourced from agricultural lands.…”

“…In another study, Simorte et al [20] emphasized that walnut tree is very responsive to frequent nitrogen fertilizer applications as the growth of both root and aerial parts were significantly suffered in deficient conditions, indicating the need for slow-release nutrients source supplying nitrogen throughout the entire growing season. Likewise, Bravo et al [21] stated the walnut tree requires a relatively high amount of nitrogen and application time influence the nitrogen use efficiency. Assuming the slow-release characteristics of waste originated nutrients [8], PAS application could optimize the nutrient use efficiency and growth of fruit tree as well as help environmental protection sourced from agricultural lands.…”

“…Walnut trees are a widely grown temperate fruit tree crop and its planting acreage is expanding , particularly in low fertility soil. Nutrient and water management practices after tree orchard establishment have strong contributions on tree growth during the first few years after planting.…”