بررسی عکس العمل ارقام جدید پنبه نسبت به آرایش کاشت جهت تعیین صفات مناسب برداشت مکانیزه در خراسان رضوی

This experiment was carried out as split plot by using randomized complete block design with 2 factors in 2009 - 2011.
The objective of this study was evaluation of reaction on vegetative and reperdective organs to change plant spacing of
cotton cultivar for mechanized picking. factor A, were 3 cotton cultivar, and factor B, were 6 plant patterns. The results
showed that decreasing of plant spacing had no effect on plant height and plant height with boll but it caused to increase
the height of the lowest branch of bolls. It is desirable treatment at mechanized picking. For mechanized picking, plant
size and earliness are important and it improved mechanized picking. In B-557 cultivar which is a compact cultivar,
reducing the distance a plant from 25 to 5 cm, the length vegetative branches was reduced about 19 cm and this
reduction in Golestan and Armghan were about 22 and 16 cm. Also earliness perecentage seed cotton in100×5cm was
about 6.11 % more than100×25cm. It seems, by reduation plant spacing, lenth of vegetative and reperdactive branches
and plant size were reduced also cotton bolls were closed to mainstem so this cause to increased earleyness. The results
in kashmer showed The among cultivars tested .There werenot any varation of plant height, number sympodial branches
and bolls buthad signefecent different in total yield and first harvesting yield and earlyness of cotton.The Kc-8802
cultivar had the highest total yield and first harvesting yield and earliness percentage . finally, reduction in plant spacing
of Golestan and Armghan cultivars cauld be used to make appropriate plant forms which is facilitated for mechanized
harvest.