Effects of defoliation on yield, leaf color, calcium contents in turnip rape (Brassica napus L.)
1999
Hayashida, T. (Fukuoka-ken. Agricultural Research Center, Chikushino (Japan)) | Shibato, Y. | Morifuji, N.
Effects of defoliation on seasonal yield, leaf color and calcium contents in turnip rape (Brassica napus L.) were examined. 1) Defoliation in October did not influence total yield and the number of lateral shoots. However, excessive defoliation significantly reduced the yield and the number of lateral shoots on cultivar 'KEICHIKUZAIRAISYU' in December. Also, it influenced leaf color. On cultivar 'ABURAMASARI', excessive defoliation tended to reduce the same. 2) On cultivar 'ABURAMASARI', defoliation in October increased total and water soluble calcium contents in November. It also increased the ratio of water soluble calcium to total calcium contents in November. However, after December, defoliation did not influence total calcium and water soluble calcium contents. 3) Defoliation in October improved working conditions by making it less laborious at harvest time, but did not influence total yield and quality adversely. Also, it worked to increase the calcium contents
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