Effects of water-nitrogen coupling on growth, development and yield of pumpkin

Abstract

To investigate the reasonable water and nitrogen regulation system of drip-irrigated pumpkin in arid and semi-arid areas. A randomized block group design was adopted, and two irrigation levels were set: 55%～65%FC (FC is the amount of water held in the field), 65%～75%FC , and 75%～85%FC (W1, W2, and fully irrigated); and four nitrogen application levels of 100, 150, 200, and 250 kg/hm² (pure N) (N1, N2, N3, and N4). The results showed that water and N fertilization had significant (p<0.05) effects on pumpkin main vine length and stem thickness. Compared with CK treatment, the other treatments significantly reduced the vine length by 3.58% to 17.14%; compared with W2N3, the other treatments significantly reduced the stem thickness by 1.40% to 13.95%. Under the same level of nitrogen application, pumpkin vine length and stem thickness showed an increasing trend with the increase of irrigation volume, which was shown as fully irrigated>W2>W1. The interaction of irrigation, fertilization and water-nitrogen factors had highly significant effects on pumpkin yield (p<0.01), and W2N3 (nitrogen in water in the middle water) obtained a high yield of pumpkin doing (46,031.76 kg/ha²), and it played a role in saving water and reducing nitrogen and increasing yield for the cultivation of pumpkin in the oasis of the west of the river. The effect of reducing nitrogen and increasing yield.