Effect of Planting Density, Seed Tuber Size and Boron Application On Potato Yield And Chemical Composition

Abduljabbar I. Marie, Rofaiel S. Toma

Abstract


This study was conducted at vegetable field of Agric. College/ Dohuk Univ., Iraq, to study the effect of tow planting density (58664 and 38132 plants/ ha) with three tuber sizes (25- 40, 40- 55 & more than 55 mm.) in addition to three levels of boron (0.0, 0.5 & 1.0 Kg Boron/ ha.) on the marketable yield of potato (Desiree cv.). The results revealed that Planting density with 58664 plants/ ha. gave an increase estimated with 53.99% & 59.22% in the marketable yield in 1999 / 2000 & 2000 / 2001 growing seasons respectively as compared with planting density 38132 plants/ha. Foliar application of boron with 1.0 kg / ha caused significant effects on yield quality and quantity by increasing the marketable yield with 61.8% & 66.3%, tuber weight per plant with 60% & 59.4%, number of tubers per plant with 21.869% & 22.967%, average tuber weight with 33% & 31%, An increase in starch percentage with 12.8% & 15.2%, protein percentage with 12.9% & 12.3% and in vitamin-C content with 38.6% & 34.1% in tubers by using 1.0 kg Boron/ha in both growing season 1999/ 2000 and 2000/ 2001. Increasing the size of seed tubers gave higher marketable yield estimated with 30.5% & 27.6%, 33.8% & 27.1% in tuber weight per plant and 33.03% & 31.4% in the number of tubers per plant in both growing season 1999/ 2000 & 2000/ 2001 respectively.
The interaction among planting density 58664 plants/ ha, boron level 1.0 kg. / ha and larger size of seed tubers (more than 55 mm.) gave higher marketable yield in both seasons.

Keywords


Potato Tubers , Planting density , Boron

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