By BIOTOL (Project); Open Universiteit (Heerlen, Netherlands); University of Greenwich

ISBN-10: 075060560X

ISBN-13: 9780750605601

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2006), harvest index has not changed in North American hybrids, although there is some evidence of higher harvest index in recent years (Duvick, 2005; Tollenaar and Lee, 2002, 2011). AGRONOMIC DRIVERS FIG. 10 Leaf photosynthesis at saturated light levels as a function of weeks from silking in old (Pride 5) and new (NK 25-J7) maize hybrids exposed to high (upper panel) and low nitrogen (N) conditions (bottom panel). Vertical bars represent two standard errors of the mean. Adapted from Echarte et al.

The practice of two or more maize crops before a soybean crop is infrequent, but can occur when continuous maize production in a particular field must be interrupted with soybean to mitigate the build-up of some maize-specific disease or pest, or when soybean price at sowing time is substantively more favorable than concurrent maize price. The latter scenario could induce continuous maize producers to take advantage of that soybean price advantage and couple it with the substantive soybean yield bump that occurs.

Source: USDA-NASS. Tollenaar and Lee, 2011). Similarly, a combination of environmental, largely warming, and technological innovations including new varieties, are shifting the spatial and temporal boundaries of cropping systems in China (Chapter 3) and northern Europe (Chapter 4). 5 plants m−2. , 2011a; Roekel and Coulter, 2011). 5). On-farm average soybean plant density is typi- cally 35–45 plants m−2, which is higher than the required plant density for maximum yields (25–35 plants m−2) due to lower seed cost compared with hybrid maize, varying little across regions or water regimens (De Bruin and Pedersen, 2009).

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Crop physiology by BIOTOL (Project); Open Universiteit (Heerlen, Netherlands); University of Greenwich


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