![Environmental implications of low nitrogen use efficiency in excessively fertilized hot pepper (Capsicum frutescens L.) cropping systems [An article from: Agriculture, Ecosystems and Environment]](https://www.ebooknetworking.net/books/B00/0RR/bigB000RR528Q.jpg)
Environmental implications of low nitrogen use efficiency in excessively fertilized hot pepper (Capsicum frutescens L.) cropping systems [An article from: Agriculture, Ecosystems and Environment]
Book Details
PublisherElsevier
ISBN / ASINB000RR528Q
ISBN-13978B000RR5281
AvailabilityAvailable for download now
Sales Rank99,999,999
MarketplaceUnited States 🇺🇸
Description
This digital document is a journal article from Agriculture, Ecosystems and Environment, published by Elsevier in . The article is delivered in HTML format and is available in your Amazon.com Media Library immediately after purchase. You can view it with any web browser.
Description:
A randomized-block greenhouse plot experiment was conducted on N utilization efficiency and N losses in intensive hot pepper (Capsicum frutescens L.) production systems typical of commercial practice in Shouguang, an important vegetable production area in Shandong province, northeast China. Crop yield and N utilization, soil mineral N dynamics and potential nitrate leaching losses were studied in control plots receiving no N fertilizer or organic manure and in experimental plots receiving 0, 600, 1200 or 1800kg urea-Nha^-^1 plus a basal dressing of 15tha^-^1 air-dried poultry manure supplying 178kgNha^-^1. Ammonia volatilization from the soil surface was monitored. A microplot was established in each of the plots receiving 1200kg urea-Nha^-^1 (the local average commercial fertilizer N application rate), the urea applied to the microplot was labelled with 10atom % ^1^5N tracer and residual soil ^1^5N and ^1^5N in harvested plant parts were determined. Previous intensive cropping led to a very high residual soil mineral N content (1117kgNha^-^1) before the experiment began and control plots gave a satisfactory mean fruit yield of 5.7tDMha^-^1 with no significant yield response to applied fertilizer and poultry manure. Only 10% of applied fertilizer N was recovered in the aboveground parts of the crop and about 52% was lost from the soil-plant system. Substantial nitrate leaching losses occurred using the two highest fertilizer N application rates but there was little NH"3 volatilization from the soil surface. In a survey of 94 wells in Shouguang, the NO"3^--N concentrations in water used for drinking and irrigation were determined. Almost half of 94 local wells surveyed had NO"3^--N concentrations above the USEPA public drinking water maximum contaminant level of 10mgL^-^1. The data indicate that N inputs for intensively managed vegetable crops in northeast China should be reduced urgently to maintain crop yields while avoiding serious long-term environmental damage.
Description:
A randomized-block greenhouse plot experiment was conducted on N utilization efficiency and N losses in intensive hot pepper (Capsicum frutescens L.) production systems typical of commercial practice in Shouguang, an important vegetable production area in Shandong province, northeast China. Crop yield and N utilization, soil mineral N dynamics and potential nitrate leaching losses were studied in control plots receiving no N fertilizer or organic manure and in experimental plots receiving 0, 600, 1200 or 1800kg urea-Nha^-^1 plus a basal dressing of 15tha^-^1 air-dried poultry manure supplying 178kgNha^-^1. Ammonia volatilization from the soil surface was monitored. A microplot was established in each of the plots receiving 1200kg urea-Nha^-^1 (the local average commercial fertilizer N application rate), the urea applied to the microplot was labelled with 10atom % ^1^5N tracer and residual soil ^1^5N and ^1^5N in harvested plant parts were determined. Previous intensive cropping led to a very high residual soil mineral N content (1117kgNha^-^1) before the experiment began and control plots gave a satisfactory mean fruit yield of 5.7tDMha^-^1 with no significant yield response to applied fertilizer and poultry manure. Only 10% of applied fertilizer N was recovered in the aboveground parts of the crop and about 52% was lost from the soil-plant system. Substantial nitrate leaching losses occurred using the two highest fertilizer N application rates but there was little NH"3 volatilization from the soil surface. In a survey of 94 wells in Shouguang, the NO"3^--N concentrations in water used for drinking and irrigation were determined. Almost half of 94 local wells surveyed had NO"3^--N concentrations above the USEPA public drinking water maximum contaminant level of 10mgL^-^1. The data indicate that N inputs for intensively managed vegetable crops in northeast China should be reduced urgently to maintain crop yields while avoiding serious long-term environmental damage.
