EFFECTS OF CUTTING FREQUENCY AND NITROGEN FERTILIZATION ON DRY MATTER YIELD OF REED CANARYGRASS (Phalaris arundinacea L.) IN UNCULTIVATED RICE PADDY원문보기
Lee, J.S.
(Department of Biological Resources & Technology, College of Liberal Arts & Sciences, Yonsei University)
,
Ahn, J.H.
(Department of Dairy Science, Faculty of Agriculture, Anseong National University)
,
Jo, I.H.
(Department of Animal Science, College of Natural Resources, Taegu University)
,
Kim, D.A.
(Department of Animal Science & Technology, College of Agriculture and Life Sciences, Seoul National University)
Dry matter yield of reed canarygrass was investigated in uncultivated rice paddy in Korea, and an attempt was made to estimate the most economic and efficient cutting frequency and rates of nitrogen (N) fertilization, for increased production of reed canarygrass. Total dry matter yields of reed cana...
Dry matter yield of reed canarygrass was investigated in uncultivated rice paddy in Korea, and an attempt was made to estimate the most economic and efficient cutting frequency and rates of nitrogen (N) fertilization, for increased production of reed canarygrass. Total dry matter yields of reed canarygrass per year were 7.4-15.7, 8.5-16.1, and 7.5-13.4 tons/ha in 3, 4, and 5 cutting frequencies, respectively, and over the N treatments of 0-120 kg N/ha/cut. When cut 3 or 5 times annually, the 2nd cut produced the highest proportion of total yield at 38.4 and 33.0%, respectively, when cut 4 times the 3rd cut was highest (38.3%). The ranges of economic N level, limiting N level and efficiency of dry matter production were 243.3-293.0, 387.2, and 14.6 kg DM/kg N, respectively. These indicators were particularly low for the 5 cutting frequency possibly because of the unusually high temperature in the summer season. The best cutting frequency for the dry matter production of reed canarygrass in 1994 was 3 per year because of the higher efficiency of dry matter production.
Dry matter yield of reed canarygrass was investigated in uncultivated rice paddy in Korea, and an attempt was made to estimate the most economic and efficient cutting frequency and rates of nitrogen (N) fertilization, for increased production of reed canarygrass. Total dry matter yields of reed canarygrass per year were 7.4-15.7, 8.5-16.1, and 7.5-13.4 tons/ha in 3, 4, and 5 cutting frequencies, respectively, and over the N treatments of 0-120 kg N/ha/cut. When cut 3 or 5 times annually, the 2nd cut produced the highest proportion of total yield at 38.4 and 33.0%, respectively, when cut 4 times the 3rd cut was highest (38.3%). The ranges of economic N level, limiting N level and efficiency of dry matter production were 243.3-293.0, 387.2, and 14.6 kg DM/kg N, respectively. These indicators were particularly low for the 5 cutting frequency possibly because of the unusually high temperature in the summer season. The best cutting frequency for the dry matter production of reed canarygrass in 1994 was 3 per year because of the higher efficiency of dry matter production.
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제안 방법
, 1989). In this study, the dry matter production of reed canarygrass： was investigated in response to the cutting frequency and N fertilization.
Soil type was clay loam. The experiment wasResults a split plot design with main treatments (cutting frequencies of 3, 4 or 5 occasions) randomly arranged in 3 replicate blocks. Each main plot was split into 5 subplots (each 2 m x 2 m), representing rates of 0, 30, 60, 90 and 120 kgN/ha/cut and the N was fertilized in the form of urea.
대상 데이터
Venture) was used for the experiment. It was grown on Migum farm, Namyangju-si, Kyunggi-do, Korea from April to October in 1994. The trial site had been used for rice production by 1991 and afterwards, it was drained and reed canarygrass has been established.
Reed canary grass (var. Venture) was used for the experiment. It was grown on Migum farm, Namyangju-si, Kyunggi-do, Korea from April to October in 1994.
성능/효과
In this study, both economic N level and limiting N level were lowest at 5 cutting frequency (243.3-297.0 and 387.3 kg/ha, respectively) (table 4) and the efficiency of dry matter production was also lowest (table 5), in particular at the 120 kg/ha/cut level. Ihe unusally warm summer in 1994 combined with too short regrowth period in the 5 cut system could have contributed to this result.
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