Abstract
The effect of different sources of Nitrogen (N), time and method of application on growth and development of potato was investigated over two seasons using the cultivar Dutch Robjyn. The three sources of nitrogen (Calcium Ammonium Nitrate (CAN, 26% N); Urea (46% N) and Ammonium Sulphate Nitrate (ASN, 27%N)] constituted the main plot treatments, and time [early application, split application (half of the fertiliser at planting and half applied 5 weeks after emergence), and late application (5 weeks after emergence)] and method of application (placement and broadcast within the furrow) constituted the subplots treatments. Early application of N followed by split applied fertiliser led to a fast early growth (shoot, tuber, root and total dry matter, Leaf Area Index (LAI) development, and plant height) particularly where CAN or ASN was applied. Late N application enhanced growth of the shoots (leaves and plant height) later in the growth season particularly with Urea. Broadcast or placement of N in the furrow had no significant effect (P
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