Is nitrogen transferred between field crops? examining the question through a sweet-blue lupin (Lupinus angustifolius l.)-oats (Avena sativa) intercrop

Nitrogen uptake and transfer in broad bean and garlic strip intercropping systems

“…The possible mechanism and necessary conditions for N transfer between intercropped plants are still controversial. Many studies show that N transfers from legumes to gramineous plants (Ledgard et al 1985;Ta et al 1989;Fujita et al 1990;Papastylianou and Danso 1991;Ofosu-Budu et al 1993;Tomm et al 1994;Johansen and Jensen 1996), while other studies show that little or no N transfers from legumes to non-legumes (Hamel et al 1991;Papastylianou and Danso 1991;Danso et al 1993;Trannin et al 2000). In the present study, 15 N was injected to the petioles of broad bean plants intercropped with garlic in pot and field experiments.…”

“…15 N tracer approach can be used to measure the N-fixing ability of legumes in an intercropping system directly and N absorption from different sources such as soil, fertilizer, and air (Zhu and Yang 1992). Using the 15 N tracer approach, the study of Danso et al (1993) revealed that intercropping, compared with sole crop, improved N absorption by 26.3% and biomass by 21%. Fujita et al (1990) found N transfer from pea (Pisum sativum L.) to sorghum (Sorghum bicolor L.) accounted for 32-58% of the total N absorption of sorghum in a pea-sorghum intercropping system.…”

Effect of Soybean Plant Populations in a Soybean and Maize Rotation

“…The importance of reduced use of soil N by legumes for increasing N availability to nonlegumes in cropping systems has been emphasized (Danso et al, 1993). Green and Blackmer (1995) attributed the N credit value when maize succeeds soybean to the difference in immobilization rates during residue decomposition of soybean and maize rather than the mineralization of N from biological N 2 fixation by soybean.…”

Land Equivalent Ratio of Groundnut-Fingermillet Intercrops as Affected by Plant Combination Ratio, and Nitrogen and Water Availability

“…While N transfer from legumes to cropping in these areas, may be its higher productivity companion cereals has long been suggested (Papasthan sale crops. tylianou and Danso, 1991), contradicting data also exist Of the several mechanisms associated with higher (Aggarwal et al, 1992;Cowell et al, 1989;Danso et al, yield advantages in intercrops, the most probable one is 1993 ; Izauralde et al, 1992;Morris et al, 1990). that component crops in the intercrop can complement Recently, researchers have centered their speculation on each other and environmental resources can be used the improvement in water environment due to intercropmore efficiently than sole crops (Aggarwal et al, 1992; ping as a major cause of the frequently reported inter- Hulugale and Lal, 1986;Reddy and Willey, 1981; cropping advantages (Harris and Natarajan, 1987;Willey, 1979;Willey, 1990).…”