Author: Michael John MlynarekPublisher:
ISBN:
Category :
Languages : en
Pages : 252
Book Description
Evaluation of a Nitrification Inhibitor for Improving Corn Nitrogen Fertilizer Efficiency on Irrigated Sands
Author: Michael John MlynarekPublisher:
ISBN:
Category :
Languages : en
Pages : 252
Book Description
EPA-600/2
Author: Publisher:
ISBN:
Category : Environmental engineering
Languages : en
Pages : 702
Book Description
Nitrification Inhibitor, Nitrogen Source, and Herbicide Effects on Soil Bitrogen Transformations and Corn Yield
Author: William NeelsPublisher:
ISBN:
Category :
Languages : en
Pages : 0
Book Description
Nitrogen is the most limiting nutrient for crop production; however, its management has been challenging due to increasing nitrogen losses. Increased N losses have led researchers to focus on strategies for improving Nitrogen Use Efficiency (NUE). In this study, we took an integrated approach to compare the effects of N source, nitrification inhibitor and herbicide on nitrification, N loss, crop yield, residual N, and NUE. We first evaluated these factors in a twoyear field experiment. A laboratory soil incubation experiment followed. The treatments included a combination of nitrification inhibitor vs. no inhibitor, two nitrogen fertilizer sources (broadcast urea vs. injected aqueous ammonia), and a pre-emergence herbicide vs. no herbicide. Results indicated that nitrogen source has a more significant effect on NH4 + -N retention (78-80% higher in anhydrous ammonia vs. urea) than nitrification inhibitor (24-47% higher with inhibitor vs. without inhibitor) and herbicides. Similarly, nitrogen source significantly affected NO3 - -N formation (134-176% lower in anhydrous ammonia vs. urea) than nitrification inhibitor (8-31% lower with inhibitor vs. without inhibitor) and herbicides. We then evaluated the effect of nitrification inhibitor, nitrogen fertilizer source, and herbicide on (1) soil nitrification through a 25 day-soil incubation and (2) NH3 volatilization, NO3 - -N leaching, and N2O emissions through a 31-day soil column study using a loamy sand soil. Results indicated that nitrogen source had a greater effect on reducing nitrification (32.5% lower with injected aqueous ammonia vs. surface broadcast urea) compared to nitrification inhibitors (4% lower with inhibitor vs. without inhibitor) and herbicide (no effect). Surface broadest urea increased NH3 volatilization by 673% compared to injected aqueous ammonia. Injected aqueous ammonia had 22% higher NO3 - -N leaching and 33 % higher NH4 + -N leaching than urea, while nitrification inhibitor had an inconsistent effect on NO3 - -N leaching across both N sources. The results of both experiments indicated that nitrogen source plays a more significant role in regulating soil nitrogen losses than nitrification inhibitors and herbicide..
Selected Irrigation Return Flow Quality Abstracts
Author: Selected Irrigation Return Flow Quality Abstracts, 1978
Author: Gaylord V. SkogerboePublisher:
ISBN:
Category : Irrigation
Languages : en
Pages : 360
Book Description
Modification of Nitrogen Fertilisers Using Inhibitors
Author: Catherine J. WatsonPublisher:
ISBN: 9780853102953
Category : Nitrogen fertilizers
Languages : en
Pages : 0
Book Description
When fertilizer nitrogen (N) is applied to soil it is not used efficiently and plant N uptake is seldom greater than 50% of the N applied. One of the reasons for poor N use efficiency is high losses from the plant-soil system by ammonia (NH3) volatilization, during nitrification and by leaching, erosion, surface runoff and denitrification. The loss of N represents an economic loss to farmers and has environmental implications for water quality and greenhouse gas emissions. Stabilised N fertilizers (urease and nitrification inhibitors) have received considerable attention recently due to their potential to lower N losses to the environment and increase crop yields. However, the efficacy of urease and nitrification inhibitors can be quite variable depending on the crop, soil properties, climatic and management factors. Many compounds have been evaluated as urease or nitrification inhibitors however, few meet the requirements of being effective at low concentrations, non toxic, stable, inexpensive and compatible with standard N fertilizers. Urease inhibitors delay the rate of urea hydrolysis to ammonium-N (NH4+-N) and hence prevent localised zones of high pH and NH4+-N concentrations in soil, which are conducive to NH3 volatilization. They are expected to be most beneficial on soils where NH3 volatilization from urea fertilizer is high. The urease inhibitor N-(n-butyl) thiophosphoric triamide (trade name Agrotain(r)) is the most successful commercially, where it has been shown to lower NH3 volatilization from surface-applied urea and increase yields on a wide range of crops. Agrotain is now licensed or sold in over 70 countries worldwide, in both agricultural and amenity markets.
Selected Water Resources Abstracts
Author: Proceedings of the ... Fertilizer, Aglime and Pest Management Conference
Author: Evaluation of Enhanced Efficiency Nitrogen Fertilizers on Corn Production Systems in the Mid-South
Author: Shanice M. JonesA Nitrogen Balance Study on the Effectiveness of Nitrapyrin as Influenced by Incorporation on Irrigated Maize
Author: Daniel Thomas WaltersPublisher:
ISBN:
Category :
Languages : en
Pages : 532
Book Description