تأثیر قطع آبیاری بر عملکرد، شاخصهای رقابتی و اقتصادی کشت مخلوط جو با حبوبات

Abstract

To evaluate the competitive and economic indices of intercropping barley cultivars with pea and faba bean under irrigation regimes, a field experiment was conducted at College of Agriculture and Natural Resources of Darab, Shiraz University in 2014. Treatments were included two levels of irrigation regimes (full irrigation and cutting off irrigation at milk development of barley) and 8 cropping treatments consisted of monoculture of Nimroz tow-rowed barley, Zehak six-rowed barley, pea and faba bean and intercropping of Nimroz+pea, Nimroz+faba bean, Zehak+pea and Zehak+faba bean with a ratio of 1:1 which laid out as split plot arrangement in randomized complete block design with three replicates. Cutting off irrigation decreased 20, 43 and 40% barley cultivars, pea and faba bean yield, respectively and increased 1.9, 42 and 20% land equivalent ratio (LER) of cereals, legumes and total, respectively. Aggressivity (A) and competitive ratio (CR) indices showed that in full irrigation conditions, barley cultivars were dominant species and at drought stress condition competitive power of legumes increased. In full irrigation, actual yield loss indices (AYL) of barley cultivars, legumes and total was positive, negative and zero, respectively and intercropping advantage indices of barley cultivar was positive and in legumes and total was negative. Likewise, AYL and IA indices, in cereals, legumes and total were positive. The maximum grain yield in barley cultivars, pea and faba bean was obtained at sole cropping treatments, while LER of all intercropping treatments was higher than 1. System productivity index (SPI) for all of intercropping treatment was positive. Overall, evaluation of competitive and economic indices showed that intercropping of six-rowed Zehak barley with pea was advantageous than the other cropping systems under drought stress.