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V. R. Haden
Cornell University
6Publications
6H-index
94Citations
Publications 6
Newest
#1Xiang JingH-Index: 1
#2V. R. HadenH-Index: 6
Last.Chen HuizheH-Index: 4
view all 10 authors...
Recent studies have reported that poor growth of aerobic rice associated with urea induced ammonia toxicity when applied at early growth stage. The objective of this study was to examine the effect of different methods of nitrogen application on plant growth of aerobic rice grown in continuous aerobic rice system. Micro-plot experiment was conducted in 2008 dry season in a field where aerobic rice has been grown for fourteen seasons in International Rice Research Institute (IRRI) farm. Two Pot a...
17 Citations
#1V. R. Haden (Cornell University)H-Index: 6
#2Jing Xiang (Rice University)H-Index: 3
Last.John M. Duxbury (Cornell University)H-Index: 31
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Recent studies indicate that aerobic rice can suffer injury from ammonia toxicity when urea is applied at seeding. Urea application rate and soil properties influence the accumulation of ammonia in the vicinity of recently sown seeds and hence influence the risk of ammonia toxicity. The objectives of this study were to (i) evaluate the effects of urea rate on ammonia volatilization and subsequent seed germination for a range of soils, (ii) establish a critical level for ammonia toxicity in germi...
6 CitationsSource
#1V. R. Haden (Cornell University)H-Index: 6
#2Jing Xiang (Rice University)H-Index: 3
Last.John M. Duxbury (Cornell University)H-Index: 31
view all 8 authors...
Recent studies have documented adverse affects of urea on the establishment and growth of aerobic rice when applied at seeding. The following experiments were conducted to examine the relative importance of ammonia and nitrite (NO) toxicities as mechanisms contributing to poor germination and early growth of aerobic rice. Soil was collected from an experiment in the Philippines where aerobic rice was grown continuously for 7 years. Subsamples of the soil were: (1) pretreated with sulfuric acid (...
20 CitationsSource
#1Jing Xiang (HAU: Huazhong Agricultural University)H-Index: 6
#2V. R. Haden (Cornell University)H-Index: 6
Last.Kehui Cui (HAU: Huazhong Agricultural University)H-Index: 24
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Abstract A yield decline and increase in soil pH under continuous cropping of aerobic rice have been reported in previous studies. However, the underlying mechanisms governing the poor growth and low yield of aerobic rice following an increase in soil pH are unknown. The objective of the present study was to determine the effect of soil acidification on the soil nutrient availability, plant nutrition and growth of aerobic rice grown in continuously cropped aerobic soil. Two pot experiments were ...
14 CitationsSource
#1V. R. Haden (Cornell University)H-Index: 6
#2John M. Duxbury (Cornell University)H-Index: 31
Last.John E. Losey (Cornell University)H-Index: 22
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ABSTRACT The system of rice intensification (SRI) prescribes the use of young seedlings, planted at reduced densities and managed using reduced irrigation and frequent mechanical weeding, as a means of optimizing rice yields and reducing input costs. Such changes in management practice have been known to result in prominent shifts in weed flora, which if anticipated could help refine future weed control strategies. This study, conducted at four locations in West Java, Indonesia, examines the eff...
16 CitationsSource
#1V. R. Haden (Cornell University)H-Index: 6
#2Quirine M. Ketterings (Cornell University)H-Index: 27
Last.J. E. Kahabka (Cornell University)H-Index: 2
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In many states, Morgan (M) or Mehlich-3 (M3) extractions are the basis for P fertility recommendations and P runoff risk assessment. The impact of timing of sampling, P source, and extractable Al on agronomic soil test P (STP) and P release to the environment are not well understood. Incubation studies were conducted to determine: (i) changes in M-P, M3-P, and 0.01 MCaCl 2 -P with time following Ca(H 2 PO 4 ) 2 addition; (ii) the efficiency of liquid dairy manure, NH 4 HPO 4 , and Ca(H 2 PO 4 ) ...
21 CitationsSource
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