Balance sheet of15N labelled urea applied to rice in three Australian vertisols differing in soil organic carbon

Zia, M. S.; Waring, SA

doi:10.1007/bf01049420

Cited by 6 publications

(4 citation statements)

References 19 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The results of the present study revealed that prior fallow or crop treatments influenced the pattern of N mineralisation both before and during the rice crop. Rapid N mineralisation after the legume crops had both positive and negative effects; early growth of the rice crop was certainly enhanced but excess soil nitrate-N was lost, probably due to denitrification (Zia and Waring 1987) when the crop was repeatedly flooded during rice crop establishment. Since nitrate-N did not accumulate at 0.150.30 in the soil profile (data not presented), N loss through leaching was considered unlikely.…”

Section: Discussionmentioning

confidence: 99%

Prior crop and residue incorporation time affect the response of paddy rice to fertiliser nitrogen

Ockerby¹,

Garside²,

Adkins³

et al. 1999

Aust. J. Agric. Res.

View full text Add to dashboard Cite

Crop residues are an important source of nitrogen (N) for rice (Oryza sativa L.). The objective of this research was to determine how the supply of mineral N from different prior crops or fallow might affect the growth and yield of rice. The study also tested whether N use by rice might be improved by timing the application of inorganic fertiliser N to supplement the N mineralised after prior crops. Experiments consisted of fallow, or cereal or legume crops in the dry-season followed by wet-season rice; and fallow, or cereal or legume crops in the wet- season followed by dry-season rice. Urea at one-third of the rate required for optimum rice yield was applied at 3 times during the rice crop: sowing, permanent flood, and/or panicle initiation. The prior fallow and crop treatments significantly influenced the growth and yield of rice crops. After a fallow, the pattern of soil N mineralisation promoted vegetative growth but was limiting during grain-filling. In contrast, after a cereal crop, rice vegetative growth was limited but grain-filling was promoted. Legume prior crops promoted both vegetative and grain growth. The benefits derived from growing the cereal or legume crops before rice, in terms of replacing fertiliser N, were dependent on the time at which fertiliser N was applied to the rice crop. In particular, legume crops frequently nullified the rice growth responses to fertiliser N. The results demonstrated that fallow and prior crops can alter the amount and timing of mineral N supply to a rice crop. Farmers should consider including a legume crop in rotation with rice because legumes supply N, which increases rice yield and reduces the requirement for fertiliser N. Cereal crops also contribute N, although farmers who use a cereal rotation should monitor the soil and crop N status during early rice growth, and supply extra fertiliser N to alleviate N deficiency.

show abstract

Section: Discussionmentioning

confidence: 99%

Prior crop and residue incorporation time affect the response of paddy rice to fertiliser nitrogen

Ockerby¹,

Garside²,

Adkins³

et al. 1999

Aust. J. Agric. Res.

View full text Add to dashboard Cite

show abstract

“…Due to these conditions, N use efficiency for crop production is decreasing with time. For upland grain crops, it hardly exceeds 50% (Roy & Chandra, 1979) and for irrigated flooded and lowland rice, it varies between 30-45% (Mikkelson & DeDatta 1979;Zia & Waving, 1987). In view of the high cost of nitrogen fertilizers, it is important to improve the N utilization efficiency for crop production with the objective to reduce cost of production.…”

Section: N2mentioning

confidence: 99%

Nitrogen Management in Calcareous Soils: Problems and Solutions

Maqsood¹,

Awan²,

Aziz³

et al. 2016

PAKJAS

View full text Add to dashboard Cite

Nitrogen (N) is the most widely applied plant nutrient and is a key constituent of animal manures. Improvement in crop yields and high economic returns have been made possible through supplementation of crops with organic and inorganic fertilizers. The movement of N in the environment has been extensively studied and documented. The fate of N ranges from nitrification, denitrification, nitrous oxide formation, leaching of nitrate, and volatilization of ammonia. Even with this knowledge the variation in N movement within the soil, air and water varies greatly with changed edaphic factors. For instance the fate of N fertilizer under calcareous soil systems still has not been investigated widely. We reviewed the sporadic information available on N fate and management in calcareous soils especially in Pakistan. We discussed the sources and fate of N in calcareous soils of Pakistan and also the currently adopted and newly developed method to reduce the N losses.

show abstract

“…However, the effects of soil drying and flooding on N losses in past greenhouse and field studies have been inconsistent. In some greenhouse (Eriksen et al, 1985;Sharif Zia and Waring, 1987) and field studies (De Datta et al, 1983), alternate soil drying and flooding increased fertilizer N loss. De Datta et al (1983) were, however, uncertain if the increased N loss occurred by nitrification-denitrification or by leaching through the large cracks formed during soil drying.…”

Section: Introductionmentioning

confidence: 99%

Nitrogen losses in puddled soils as affected by timing of water deficit and nitrogen fertilization

1993

View full text Add to dashboard Cite

Erratic rainfall in rainfed lowlands and inadequate water supply in irrigated lowlands can result in alternate soil drying and flooding during a rice (Oryza sativa L.) cropping period. Effects of alternate soil drying and flooding on N loss by nitrification-denitrification have been inconsistent in previous field research. To determine the effects of water deficit and urea timing on soil NO 3 and NH4, floodwater NO 3, and N loss from added 15N-labeled urea, a field experiment was conducted for 2 yr on an Andaqueptic Haplaquoll in the Philippines. Water regimes were continuously flooded, not irrigated from 15 to 35 d after transplanting (DT), or not irrigated from 41 to 63 DT. The nitrogen treatments in factorial combination with water regimes were no applied N and 80 kg urea-N ha-~, either applied half basaily and half at 37 DT or half at 11 DT and half at 65 DT. Water deficit at 15 to 35 DT and 41 to 63 DT, compared with continuous soil flooding, significantly reduced extractable NH 4 in the top 30-cm soil layer and resulted in significant but small (

show abstract

Balance sheet of15N labelled urea applied to rice in three Australian vertisols differing in soil organic carbon

Cited by 6 publications

References 19 publications

Prior crop and residue incorporation time affect the response of paddy rice to fertiliser nitrogen

Prior crop and residue incorporation time affect the response of paddy rice to fertiliser nitrogen

Nitrogen Management in Calcareous Soils: Problems and Solutions

Nitrogen losses in puddled soils as affected by timing of water deficit and nitrogen fertilization

Contact Info

Product

Resources

About