Strategy for crop regulation in guava (Psidium guajava L.)
through foliar urea sprays and its effect on different N-forms in
leaves.
Gorakh Singh , Singh, A. K. , Shailendra Rajan , Bhriguvanshi, S.
R.
Central Institute for Subtropical Horticulture, Rehmankhera, P.O.
Kakori, Lucknow - 227 107, India.
The effects of foliar application of urea (10, 20, 25 and 30%)
as the main source of N on the growth and leaf N composition of the
guava cultivars Sardar and Allahabad Safeda were determined in a field
experiment conducted in Lucknow, Uttar Pradesh, India. Urea-N,
ammonium-N and nitrate-N in the shoot and fruits were highest with the
single application of 30% urea and double application of 20% urea in
Allahabad Safeda and Sardar, respectively. Crop yield in both cultivars
decreased with increasing urea concentration during the rainy season.
Fruit weight, total soluble solids, and ascorbic acid and reducing
sugar content were highest with foliar spraying of 25% urea on
Allahabad Safeda and decreased with increasing urea concentration in
Sardar.
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