Nitrogen

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📄 New research on use of irrigation and nitrogen in tomato greenhouses

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Submitted by Elsewhere on 2021-Jan-11 Mon 09:07
2021-Jan-11 Mon 09:07
2682

Greenhouse industry has been rapidly expanded worldwide. An accurate partitioning evapotranspiration (ET) into transpiration (T r) and evaporation (E s) is critical for developing precise irrigation scheduling and enhancing water productivity in greenhouses. In a new research, a team proposed a modified…

📄 Shelf-Life of Bunched Carrots as Affected by Nitrogen Fertilization and Leaf Presence

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Submitted by Elsewhere on 2020-Dec-16 Wed 14:45
2020-Dec-16 Wed 14:45
2522

Nitrogen (N) fertilization is essential for adequate earliness and the commercial attractiveness of carrots, but its excess could generate fast decay during postharvest, mostly in bunched carrots exhibiting their highly perishable leaves. A field experiment was conducted over the 2016–2017 growing season to address the effects of two N fertilization rates (120 and 240 kg N ha−1, hereafter N120 and N240, respectively) and leaf presence/absence (leaf+ and leaf−) on physicochemical and compositional traits of carrots cv. ‘Dordogne’, after storage at 4.0 ± 0.5 °C, 95–96% relative humidity (RH) for 0, 3, 6, 12, and 24 days (hereafter S0–S24). Before storage, carrots were arranged in bunches and packaged in common low-density polyethylene (LDPE) pouches (thickness 95 μm), 54 × 24 cm size, with 16 holes of 5 mm size. N240 carrots compared to N120 showed higher cumulative weight loss (CWL) and firmness reduction, with differences at S24 equal to 108 vs. 41 g kg−1 fresh weight (FW) and 13.3 vs. 14.5 N, respectively. N240 compared to N120 increased also the color deviation (ΔE*ab, +126%) and nitrates content (+93%) of carrots and slowed down their temporal increase of total polyphenols and antioxidant activity.

How much nitrogen does spinach really need?

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Submitted by Elsewhere on 2020-Sep-23 Wed 13:15
2020-Sep-23 Wed 13:15
1505

How much nitrogen fertilizer does winter-grown, high tunnel spinach really need? Cornell vegetable specialists had heard of some producers applying up to 600 pounds per acre. Their research conducted with Northern New York Agricultural Development Program (NNYADP) grant funding suggests that growers in…