INFLUENCE OF Nmin TARGET VALUES ON FERTILISER NEED, YIELD AND Nmin RESIDUES IN ASPARAGUS (ASPARAGUS OFFICINALIS L.)

Impacts of Long-Term Application of Best Management Practices on Yields and Root Carbohydrate Content in Asparagus (Asparagus Officinalis) (UK)

“…The low total yield in 2018 was due to a shortened harvest period which is a normal practice for the first harvest of green asparagus. The remaining 2019 and 2020 yields were slightly higher as compared to values of 5.1-5.3 t ha −1 reported by Paschold et al (2001) and very similar to a 7.06 t ha −1 average for the third harvest season recorded by Rodkiewicz (2011).…”

Decreasing Nitrate Leaching in Vegetable Crops with Better N Management

“…This, however, does not avoid the risk that amounts of nitrogen applied may exceed requirements, because of either the limitations of the method or the unwillingness of farmers to strictly adhere to the advice provided. The determination of soil mineral nitrogen often takes place in the autumn; although the long time lag between this sampling and the period of highest N demand can generate errors in estimating fertiliser requirements (Paschold et al 2001) it can also provide a useful measure of the N potentially available for leaching following harvest of the previous crop. Improved systems (e.g.…”

“…However, a similar approach in the USA (pre-side dressing nitrate test [PSNT]) seems capable of equivalent or better results by only measuring soil nitrate in the top 30 cm of soil just before the application (Hartz 2003). Those methodologies could be greatly improved if coupled with models specifically developed for vegetable crops, accounting for the potential N losses during the season as a function of weather conditions (EU_Rotate_N project newsletter 2003), which is definitely the most unpredictable factor involved (Paschold et al 2001).…”