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Soybean Yields and Lance Nematode Populations as Affected by Subsoiling, Fertility, and Nematicide Treatments 1
Author(s) -
Parker M. B.,
Minton N. A.,
Brooks O. L.,
Perry C. E.
Publication year - 1975
Publication title -
agronomy journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.752
H-Index - 131
eISSN - 1435-0645
pISSN - 0002-1962
DOI - 10.2134/agronj1975.00021962006700050020x
Subject(s) - lime , agronomy , crop , biology , soil water , soil fertility , nematode , micronutrient , chemistry , ecology , paleontology , organic chemistry
Soil compaction, nematode damage, and fertility problems occurring singly and in combination appear to be responsible for low yields of soybeans ( Glycine max (L.) Merr.) in some Coastal Plain soils. This study was designed to determine if these conditions could be corrected with certain fertility treatments, subsoiling, and a nematicide. A field study with ‘McNair 800’ soybeans was conducted in 1972–73 on a Marlboro sand (Typic Paleudult) which had a history of poor crop production. Treatments included: 1) lime, NPK, and a micronutrient mixture (B, Mn, Mo, and Zn) lime and NPK, lime and PK; 2) subsoiling under the row and no subsoiling; 3) a nematicide, 1, 2‐dibromo‐3‐chloropropane (DBCP), and no nematicide. Fertility, subsoiling, and nematicide treatments made up the main, split, and split‐split plots, respectively. Soil samples for nematode assay were taken at a depth of 0 to 20 cm in 1972 and depths of 0 to 20, 20 to 33, and 33 to 46 cm in 1973. In 1972, subsoiling or DBCP increased yields more than 60% over those of the control (no subsoiling and no nematicide) and subsoiling plus DBCP increased yields 11.7 q/ha or 88%. In 1973, subsoiling without DBCP did not affect yields significantly, but DBCP without subsoiling increased yields yields 10.6 q/ha or 74%. Subsoiling plus DBCP increased yields 13.7 q/ha or 95%. The micronutrient mixture was the only fertility treatment which increased yields significantly, but the element(s) responsible were not identified. Lance nematodes ( Hoplolaimus columbus., 1963) were numerous both years but populations were reduced in DBCP‐treated plots. In the nonsubsoiled plots without DBCP, the greatest number of nematodes occurred in the 0 to 20 cm depth and populations decreased at greater depths. In subsoiled plots, there was a relatively even distribution of nematodes for depths of 0 to 20, 20 to 33, and 33 to 46 cm. Results indicate the importance of DBCP and subsoiling for soybean production on compacted soils infested with lance nematodes.