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This article in AJ

  1. Vol. 78 No. 1, p. 5-10
     
    Received: Mar 10, 1983


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doi:10.2134/agronj1986.00021962007800010002x

Tropical Legumes for Green Manure. II. Nematode Populations and Their Effects on Succeeding Crop Yields1

  1. K. C. Reddy,
  2. A. R. Soffes,
  3. G. M. Prine and
  4. R. A. Dunn2

Abstract

Abstract

The high cost of nitrogenous fertilizer and the withdrawal of many effective nematicides from the marketplace created needs that might be partially satisfied by growing nematode-resistant legumes. Legumes resistant to prevalent nematode species could furnish N for and suppress nematode populations in succeeding crops if green manured and incorporated into the soil. The effects of tropical legumes, grown as summer green manure crops, on populations of four plant-parasitic nematodes were compared with fallow and ‘Cracker Jack’ marigold (Tagetes erecta L.) in fumigated (with 1,2-dibromethane) and nonfumigated plots in 1979, 1980, and 1981 on an Arrendondo fine sand (loamy, siliceous, hyperthermic, Grossarenic Paleudult). Long-term effects of summer legume green-manuring on nematode populations and yield of succeeding crops was determined using several cereals and legumes grown in the succeeding fall, winter, and spring seasons. One cultivar, ‘Norman’, and one line, ‘F1 81d’, of pigeonpea [Cajanus cajan (L.) Millsp.], showy crotalaria (Crotalaria spectabilis Roth.), hairy indigo (Zndigofera hirsuta L.), jointvetch (Aeschynomene americana L.), velvetbean [Mucuna deeringiana (Bort.) Merr.], and marigold reduced soil populations of rootknot nematodes [Meloidogyne incognita (Kofoid and White) Chitwood) in each year planted; ‘PI 305070’ mungbean [Vigna radiata (L.) Wilcz.] did not. Fumigation, fallowing, and rotation with jointvetch, hairy indigo, and crotalaria reduced sting nematode (Belonolaimus longicaudatus Rau.) 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.

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