Home⇛Annals of Tropical Research⇛vol. 45 no. 2 (2023)

Effects of plant spacing and rates of NPK application on the growth and yield of sweetpotato var NSIC SP30

Je-ar M. Colipano | Nello D. Gorne | Luz G. Asio

 

Abstract:

Sweetpotato yield may be increased through effective crop management practices including plant spacing and fertilization. This study was conducted in an alluvial soil (Inceptisol) to evaluate the effects of plant spacing and rates of NPK application on the growth and yield of NSIC Sp30 sweetpotato. The experiment was laid out in a split plot arranged in RCBD with three replications. Three plant spacing treatments were designated as the main plot D (75cmx25cm), D (100cmx25cm), and D (100cmx50cm). The rates of NPK 1 2 3 application were designated as the subplot: F (no NPK), F (40-40-60kg ha NPK), 0 1 -1 F (60-60-90kg ha NPK), and F (80-80-120kg ha NPK). 2 3 -1 -1 Plant spacing significantly affected the number of lateral vines, weight of marketable roots, number of marketable roots, root length, and the total root yield of NSIC Sp30 sweetpotato. An interaction effect was observed between the plants spaced at 100cmx50cm with NPK application resulting in more mediumsized roots. Plants spaced at 75cmx25cm produced the highest total root yield of 7.67t ha . -1 Application NPK significantly influenced the length of of main vines, fresh herbage yield, the weight of marketable roots, number of marketable roots, root length, root diameter, total root yield, LAI and HI. A higher yield of marketable roots 7,208.85kg ha and a root yield of 8.51t ha were observed plants -1 -1 total for applied with 40-40-60 kg ha NPK. The growth and yield performance of NSIC -1 Sp30 is better when plants are spaced at 75cmx25cm with 53,333 plants ha -1 and fertilized with 40-40-60kg ha of NPK. -1



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