The effect of nitrogen fertilization and harvest date on the magnitude of yield and the fresh matter quality of a catch crop of rye

Mironiuk, J.

Roczniki Nauk Rolniczych, A 104(2): 155-172

1979


Accession: 001005747

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Abstract
In field trials in 1970-3, rye cv. Dankowskie Selekcyjne and Dankowskie Zlote were grown as catch crops for fodder production, were given 60, 120 or 180 kg N/ha and were harvested at the stem elongation stage (at a ht. of 30-40 or 65-80 cm) or at the beginning of heading. The 2 cv. had similar yields of fresh matter, DM, CP, oat units and FU. Increasing the rate of applied N from 60 to 180 kg/ha increased fresh matter and DM yields and N and protein contents, but the most appropriate rate of applied N depended on the harvest date and the method of utilization. A rate of >60 kg N/ha was not recommended when rye was grown for grazing although higher rates were suitable when it was grown for silage. The Ca:P ratio of the fodder was generally c. 0.77-1.23 and was not harmful to animals. Mean DM yields of Dankowskie Zlote for 1971-3 ranged from 2.44 t/ha with 60 kg N/ha at the 1st harvest date to 4.65 t/ha with 180 kg N/ha at the 3rd harvest date. For Dankowskie Selekcyjne DM yields ranged from 2.28 to 4.89 t/ha for the same treatments. Max. yields of CP were 643 and 727 kg/ha for Dankowskiw Zlote and Dankowskie Selekcyjne, resp., both at the 3rd harvest date with 180 kg N/ha.