Corn grain yield, residue production, and nutrient concentration and extraction is affected by different residue incorporation rates in two biannual crop rotations

What is it about?

Crop rotations and residue management benefit the crop productivity and agriculture of conservation. The use of two biannual rotations; canola (Brassica napus L.)-corn (Zea mays L.) and bean (Phaseolus vulgaris L.)-corn rotations with four residue incorporation rates (0%, 50%, 100%, and 200%) of the preceding crop do not affected corn grain yield and residue production, but affected nutrient concentration and extraction in the corn after two rotation cycles in a volcanic soil of moderate depth in south-central Chile. Grain yield varied between 17.04 and 17.40 Mg ha-1, residue production between 16.41 and 16.50 Mg ha-1. The Ca distribution to the corn grain was negatively affected by both the preceding bean crop and increasing residue incorporation rate. The ranking of total macronutrient extraction in the corn crop was K > N > Ca > P > Mg > S. The extraction means ranged from 320.0 to 325.8, 56.0 to 57.1, 364.7 to 373.7, 86.5 to 99.3, 39.4 to 42.4, and 22.6 to 23.7 kg ha-1, whereas grain nutrient distribution coefficients ranged from 64.5 to 66.8, 90.1 to 90.9, 23.1 to 23.7, 1.3 to 2.0, 50.8 to 57.5, and 60.3 to 60.6 for N, P, K, Ca, Mg and S, respectively.

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