نوع مقاله : کامل علمی - پژوهشی
نویسندگان
1 استادیار مرکز تحقیقات کشاورزی صفی آباد- دزفول
2 دانشگاه لرستان
3 استادیار مؤسسه تحقیقات اصلاح و تهیه بذر چغندرقند، سازمان تحقیقات، آموزش و ترویج کشاورزی، کرج، ایران
چکیده
کلیدواژهها
عنوان مقاله [English]
نویسندگان [English]
In regions with autumn-sown sugar beet planting, rainfall occurrence during sugar beet growth, especially in winter, has an economic and significant role in supplying the required water. This study was conducted to determine rainfall as well as early and late irrigation proportion on sugar beet performance in randomized complete block design with three replications in Safi-Abad Agricultural Research Center in 2005-06. Treatments were composed of five irrigation levels including irrigation after 100, 150, 200, 250, 300 mm evaporation from evaporation pan (I1-I5, respectively), no-irrigation in spring (I6), seedling emergence by rainfall and spring irrigation after 100 mm evaporation from evaporation pan (I7), irrigation during the growing season after 100 mm evaporation from evaporation pan (I8) and no -rainfall as well as -irrigation in spring (I9). Significant difference was observed among treatments for quantitative and qualitative traits (P < 0.01). The highest root yield (98.9 t ha-1) and sugar yield (12.4 t ha-1) was obtained in I8 and the lowest root yield (55.7 t ha-1) and sugar yield (6.8 t ha-1) was observed in I7 treatments. The highest (16.1%) and the lowest (14.9%) sugar content was observed in I4 and I1 treatments, respectively. The highest and the lowest water use efficiency for root and sugar yield was belonged to I6 and I7, respectively. Rainfall occurrence had significantly increased root and sugar yield and also improved some qualitative traits such as K content, purity, and molasses sugar. The contribution of rainfall, irrigation on early and late of growing season on root yield were 12.3, 76.9 and 22 t ha-1, respectively and their contribution on sugar yield were 2.3, 9.9 and 2.5 t ha-1, respectively. Therefore, it seems that early irrigation plays an important role on sugar beet yield formation and spring irrigation and rainfall occurrence are in next ranks.
کلیدواژهها [English]