Group 1 - The agricultural sector increased by 2.73% on February 4, with Dayu Irrigation leading the gains [1] - The Shanghai Composite Index closed at 4102.2, up 0.85%, while the Shenzhen Component Index closed at 14156.27, up 0.21% [1] - Dayu Irrigation's stock price rose by 5.02% to 5.02, with a trading volume of 1.26 million shares and a transaction value of 639 million yuan [1] Group 2 - The agricultural sector experienced a net outflow of 62.42 million yuan from institutional investors, while retail investors saw a net inflow of 43.05 million yuan [1] - Dayu Irrigation had a net outflow of 47.04 million yuan from institutional investors, but a net inflow of 29.32 million yuan from retail investors [1] - Huilong Co. saw a net outflow of 15.38 million yuan from institutional investors, with a net inflow of 13.73 million yuan from retail investors [1]