Study On Yield Increase Benefit Of Wheat Under The Farmland Shelter Forest In Hetao Irrigation Area

Based on farmland shelter forest in Hetao irrigation area, by way of determining the plant height, spike length, spikelet number per spike, filled grain number per spike, the first internode length, internode length below spike, 1000-grain weight and yield of wheat in the different distance of farmland shelter forest leeward side and observing growth period of wheat in forest network and contrast wheat in the mean time, this paper studied the yield increase benefit of farmland shelter forest. The results are as follows:The farmland shelter forest in Hetao irrigation area can increase the wheat yield, average yield of wheat on three line selected was higher than compared wheat field significantly.the average yield increasing rate is 7.2%,8.6% and 7.4% respectively.The farmland shelter forest's positive role has improved grain quality and various physiological index of wheat. The whole growth period of wheat in forest network prolonged, period of emergence, three leaves stage, jointing, heading and flowering are ahead of time in different extent. While mature period late four days compared with contrast wheat.The farmland shelter forest in Hetao irrigation area can increase average plant height, spike length, spikelet number per spike, filled grain number per spike, internode length below spike and 1000-grain weight of wheat, then improve the wheat yield. Research shows that wheat yield reduce at 1H which is near the shelterbelt, yield increasing to the maximum at 3H, yield increasing at 4H and 5H takes the second place, yield increasing effect at 2H and 6H does not obvious, belongs to normal yield zone.