By Martin Guerena and
Preston Sullivan
NCAT Agriculture Specialists
July 2003
CURRENT TOPIC
O
RGANIC COTTON PRODUCTION
Introduction
Organic cotton has provided significant price
premiums for growers willing to meet the many
challenges inherent in its production without the
aid of conventional pesticides and commercial
fertilizers. Growing organic cotton is demanding,
but with commitment, experience, and determination,
it can be done. This publication
covers the major steps in organic production of
cotton. It covers soil fertility, weed control options,
and alternative pest controls for the many
insect problems that plague cotton. Finally, marketing
of organic cotton is discussed as well.
seed-hair fibre of a variety of plants of the genus Gossypium, belonging to the Malvaceae family, native to most subtropical countries. The shrubby plant, growing up to 6 m (20 feet) high in the tropics, characteristically ranges from 1 to 2 m in height when it is under cultivation. It produces creamy-white flowers, which soon turn deep pink and fall off, leaving the small green seedpods, known as cotton bolls, which contain the seeds. Seed hairs, or fibres, growing from the outer skin of the seeds, become tightly packed within the boll, which bursts open upon maturity, revealing soft masses of the fibres. These are white to yellowish white in colour, ranging from about 2 to 4 cm (0.75 to 1.5 inches) in length. They are composed of about 87 to 90 percent cellulose (a carbohydrate plant substance), 5 to 8 percent water, and 4 to 6 percent natural impurities.
به منظور بررسي عملكرد ماده خشك شبدر برسيم تحت تأثير مقادير كاشت آن در سيستم كشت مخلوط زير با پنبه ،آزمايشي به صورت كرتهاي خرد شده فاكتوريل در قالب طرح بلوكهاي كامل تصادفي با سه تكرار در سال 1377 در ايستگاه تحقيقات هاشم آبادگرگان به اجرا درآمد. آرايش كاشت پنبه در دو سطح(60*27 و 80*20 سانتي متر ) در كرتهاي اصلي و مقدار بذر شبدر برسيم در سه سطح (15 ، 25و 35 كيلوگرم در هكتار ) و زمان كاشت آن در سه سطح ( آغاز گلدهي، اوج گلدهي و چين اول پنبه ) به صورت فاكتوريل در كرتهاي فرعي قرار داده شدند. براساس نتايج آزمايش ، در آرايش كاشت60*27 سانتي متر عملكرد ماده شبدر برسيم در واحد سطح بيشتر از آرايش ديگر بود. از لحاظ توليد علوفه، بهترين مقدار بذر شبدر برسيم 25 كيلوگرم در هكتار و مناسبترين زمان كاشت آن آغاز يا اوج گلدهي پنبه تعيين شد
منبع.
