PNABD246.pdf

The objective of this study was to evaluate the ability of selected green
manure crops to furnish N and to reduce plant-parasitic nematode populations on
succeeding crops. This study evaluated seven tropical legumes and a marigold
(Tagetes erecta) cv. Cracker Jack grown under fumigation and nonfumigation.
Average top growth N yields in kg/ha were 40 for PI 305070 mungbean (Vigna
radiata), 250 for Norman pigeonpea (Cajanus cajan), 190 for FL 81d pigeonpea,
170 for showy crotalaria (Crotalaria spectabilis), 220 for hairy indigo
(Indigofera hirsuta), 170 for jointvetch (Aeschynomene americana), 190 for
velvetbean (Mucuna deeringiana), and O0 for marigold. The dry matter yield of
legumes with higher N yields usually exceeded 10,000 kg/ha for full-season
production in all 3 yr. Fumigation increased dry matter yield of legumes and
marigold, but not their N yield. The grass crops, rye (Secale cereale),
ryegrass (Lolium multiflorum), maize (Zea mays) and wheat (Triticum aestivum)
produced significantly higher dry matter (up to 100/) when planted after
green-manure summer legumes than when planted after summer fallow. Calculated
uptake of N from green manure by these grass crops was relatively low,
averaging from 2 to 23 kg/ha. Applying 50 and 100 kg N/ha as ammonium nitrate
to the green-manured plots did not increase recovery of N from green manure by
wheat. [AS/NMC]
*0586 Reddy, K.C. ; Soffes, A.R. ; Prine, G.M. ; Dunn, R.A. 1986. Tropical
legumes for green manure. 2. Nematode populations and their effects on
succeeding crop yields. AGRONOMY JOURNAL, v.78(I):5-l0. [En] [En Abst]
(A:PS)
The effects of tropical Legumes, grown as summer green manure crops, on
populations of four plant parasitic nematodes were compared with follow and
Cracker Jack marigold. One cultivar, Norman, and one line, FL 81d, of pigeonpea
(Cajanus cajan), showy crotaiaria (Crotalaria spectabilis), hairy indigo
(Indigofera hirsuta), jointvetch (Aeschynomene americana), velvetbean (Mucuna
deeringiana) and marigold reduced soil populations of root-knot nematodes
(Meloidogyne incognita) in each year planted; PI 305070 mungbean did not.
Fumigation, fallowing and rotation with jointvetch, hairy indigo and crotalaria
reduced sting nematode (Belonolaimus longicaudatus Ran.) populations. Rotation
with hairy indigo or marigold consistently reduced the lesion nematodes
[Pratylenchus brachyurus (Godfrey) Goodey] in all the succeeding crops.
Fumigation generally reduced ring nematode (Criconemoides spp.) populations.
Root-knot nematode and the incorporated green manure had the greatest influence
on snap bean [Phaseolus vulgaris (L.) cv. Blue Lake Bunch] dry matter yield.
[AS/NMC]
- Root-Knot Nematode
*0587 Prasad, S.K. ; Chawla, M.L. ; Kumar, S. ; Saxena, H.P. 1971.
Root-knot nematode, Meloldogyne javanica (Treub, 1885) Chitwood, 1949 and stem
borer, Stomopteryx nertaria Meyrick affecting green gram, Phaseolus aureus.
INDIAN JOURNAL OF ENTOMOLOGY, v.33i1):55-60. [En] [En Abst] (REP.MB-0508)
On the basis cf an examination of 989 plants from an area of 0.02 hectare
the plants were sorted out into four categories, viz., (i) infested with
nematode (Meloidogyne javanica) alone, (ii) infeited with borer (Stomopteryx
nertaria) alc.e, (iii) infested with nematode avid borer, and (iv) non-infested
149