تأثير الكثافة النباتية و حجم التقاوي و الرش بالبورون في حاصل البطاطا و التركيب الكيمياوي ( solanum tuberosum L.)‎

Abstract EN

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.