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Effect of Azolla Application and Plant Spacing on Rice Yield
Author(s) -
Kröck T.,
Alkämper J.,
Watanabe I.
Publication year - 1988
Publication title -
journal of agronomy and crop science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.095
H-Index - 74
eISSN - 1439-037X
pISSN - 0931-2250
DOI - 10.1111/j.1439-037x.1988.tb00328.x
Subject(s) - azolla , agronomy , sowing , transplanting , green manure , paddy field , yield (engineering) , biology , crop , mathematics , physics , thermodynamics
Azolla is a small aquatic fern, that can be used as a green manure for irrigated rice before the transplanting of rice and under the rice crop. In a field experiment the interaction between Azolla application and rice spacing and its effect on the yield of rice in Azolla‐rice dual culture were studied. The rice was planted in double‐narrow‐rows ([53 + 13] × 12cm) and in the regular 20 × 20cm spacing. Azolla was grown together with rice twice and also incorporated into the soil twice. Double‐narrow‐row planting slightly increased the Azolla growth, but reduced the grain yield due to the reduction of tillering by stronger competition between the rice plants. The Azolla application had no effect with double‐narrow‐rows. With 20 × 20cm spacing two Azolla crops had an effect equivalent to 15kg NH 4 ‐N/ha. An appreciable amount of Azolla‐N seemed to be available to the rice plants already 25 days after incorporation.