| Nutritional evaluation of corn stalk harvested and stored at different time was conducted through two trials. In trial l,six kinds of cornmon corn stalks and two kinds of entire plants of forage corn were collected in Hebei province and its chemical cornponent at different harvest time (growing time from 92-104 days) were analyzed, including biomass, wet chemical value, in vitro organic matter digestibility (IVOMD) and digestible organic matter and the chemical cornponents of six cornmon corn stalks at different storage time from 1 to 125 days was analyzed in trial 2.The results show that:In trial 1,grain yield, nutritional cornposition and the digestible organic matter of six kinds of cornmon corn (Nongda108, Gaoyou115, Zhongyuandan32, Gaoyou298, Jifeng58, Zhengdan958) and two kinds of forage corn (Keduo4 and Liaoyuanl) linearly increased with harvest time extending., but there were no significant difference when harvested after day 100 and day 104 (P<0.05). It means that extending harvest time cannot result in the yield of above items increasing. Its water solute carbohydrate (WSC) and IVOMD linearly decreased with harvest time extending (P,0.05). whereas neutral detergent fiber (NDF), acid detergent fiber (ADF) increased (P<0.05).In trial 2.IVOMD and WSC in stalks decreased quadratically with storage time, but the changing trend of NDF and ADF is the reverse of WSC (P<0.05). The major changing occurred in the early storage time. It indicated that corn stalks at early stage have good nutrition, and should be used as soon as possible. |
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