Hydraulic characteristics of conventionally and zero-tilled field plots

Negi, S.C.; Raghavan, G.S.V.; Taylor, F.

doi:10.1016/0167-1987(82)90016-2

Cited by 18 publications

(2 citation statements)

References 10 publications

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“…Total N was higher in 0-40 cm than at 40-100 cm except depth in IV soils (Table 4). This may be attributed to the activities of plant roots and soil organisms since this is known to be the zone of maximum root activities in the soil (Donahue et al 1983) and is also the effective rooting zone of most agricultural crops (Kandil et al 1976;Negi et al 1982;Wahden et al 1984). The mean profile total N content was high in IV and FP soils while MG soils had medium content (Enwezor et al 1988).…”

Section: Organic Matter Total N and C:n Ratiomentioning

confidence: 97%

Fertility status and management implications of wetland soils for sustainable crop production in Akwa Ibom State, Nigeria

Edem

Ndaeyo

2007

Environ Dev Sustain

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Fertility status of soils of three wetland types in Akwa Ibom State, Nigeria, was investigated. The wetland types are Inland Valley (IV), Flood Plain (FP) and Mangrove (MG). The soils have silt-clay ratios above 0.15 and 0.25 indicating that they are of young parent materials with low degree of weathering and possible weatherable minerals for plant nutrition. The pH of the soils was near neutral ([6.4) when wet but extremely acid ([3.5) when dried indicating that the soils are potential acid sulphate soils. Organic matter content was high with mean values of 12.59, 6.03 and 3.20% for IV, FP and MG soils, respectively. Total N (nitrogen) was low except in IV soils where the value was above the 0.30% critical level. The C:N ratios were narrow with mean of 20.90, 12.17 and 12.12 for IV, FP and MG soils, respectively. The contents of basic cations [Calcium (Ca), Magnesium (Mg), Potasium (K) and Sodium (Na)] were low while acidic cations [Aluminium (Al) and Hydrogen (H)] were high. The Ca:Mg ratios were below the optimum range of 3:1 to 4:1 required for most crops. The Mg:K ratios were above 1.2, below which yields of crops like corn and soybean may be reduced. Effective cation exchange capacity (ECEC) was below the 20 cmol/kg. Percent base saturation was low (\38) indicating that the soils are potentially less fertile. Exchangeable Al and percent Al saturation were high, above 60% in IV and FP soils. Electrical conductivity was above the critical value of 2 dsm -1 while exchangeable sodium percentage was less than 15. Available Phosphorus (P) and low,\10 ppm and free Fe 2 O 3 /clay ratios were \0.15. Positive correlation existed between silt and ECEC, implying that silt contributed to nutrient status of the soils. Generally, fertility status of the soil is low and would require maintenance of adequate organic matter, application of lime and organic and inorganic fertilizers, drainage and irrigation if the land is to be used for intensive/sustainable crop production.Readers should send their comments on this paper to: BhaskarNath@aol.com within 3 months of publication of this issue.

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Section: Organic Matter Total N and C:n Ratiomentioning

confidence: 97%

Fertility status and management implications of wetland soils for sustainable crop production in Akwa Ibom State, Nigeria

Edem

Ndaeyo

2007

Environ Dev Sustain

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“…Under puddling condition the amount of easily available water was significantly higher than the others, while under conventional tillage condition the easily available water was significantly higher than no-tillage condition. Negi et al [46] found that no-till plots had two-fold higher plant available water at a depth of 0.3 m, as did conventionally tilled plots. Under puddling condition the amount of non-available water was significantly highest which reflect the high retention capacity.…”

Section: Methodsmentioning

confidence: 98%

Long-Term Effects of Tillage on Physicochemical Properties of Modified Andisol of Northeast Honshu Island

Rahman

Tanaka

Hoque

2003

Communications in Soil Science and Plant Analysis

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Many reports suggest that tillage practices affect crop growth by altering soil properties. However, there is a paucity of information on long-term effects of tillage practices on the properties of modified Andisol in colder region. This study compared the effects of zero tillage (NT g ) with continuous fodder crop, zero tillage (NT a ) with continuous orchard, conventional tillage (CT) with sweet potato and corn (in summer), and wheat, barley, rye and colza (in winter), and puddling (P) with continuous rice on some selected physical and chemical properties of sandy clay pumice Andisol of colder climate. Mean dry bulk density was 0.92 Mg m 23 for CT, compared with 1.14 Mg m 23 for NT g , 1.16 Mg m 23 for NT a and 1.21 Mg m 23 for P. Total porosity was 63.75% for CT, compared with 55.16% for NT g , 53.72% for NT a and 52.24% for P. Highest content of organic matter (OM) was found in NT compared to other practices. On the other hand, soil pH and electrical conductivity (EC) were significantly lower under NT than other practices. The tillage had significant effects on soil hardness at different matric suction. Gaseous phase was greatest in CT soils, compared with NT a soils, and P soils. Mean solid phase was 44.84%, 45.29%, 47.46% and 36.25%, while liquid phase was 45.50%, 46.06%, 51.21% and 31.65% under NT g , NT a , P, and CT, respectively. Conventional tillage held highest moisture at 0 pF. On the other hand, puddled soil showed highest moisture retention capacities between 1.5 and 7.0 pF than zero tillage and conventional tillage. Gravitational water (GW) and gravitational capillary water (GCW) contents was highest while capillary water (CW), shrinkage water (SW) and hygroscopic water (HW) contents were lowest under CT. Gravitational drainage (GD) and non-easily available water (NEAW) were significantly lowest and easily available water (EAW), total available water (TAW) and non-available water (NAW) were significantly highest under puddling condition compared to other tillage systems. Highest content of boron (B) was found in NT compared to other practices. On the other hand, sulfur (S) and manganese (Mn) were significantly lowest under NT than other practices. Tillage practices had no significant effect on zinc (Zn) content. Compared with CT and P, the use of NT may result in soils having different soil physical and chemical properties, because the soil matrix undergoes fewer disturbances with NT.

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