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试验结果表明,在我省中部黄壤旱地及望天田种植旱作稻,由于望天田保水性较好、反潮力较强,其出苗比旱地提早4～5天,全生育期缩短5～7天,结实灌浆也优于旱地,因而产量一般也高于旱地。无论是旱地还是望天田,旱作稻从播种至出苗历经半月以上,其茎蘖消长受降雨分布的影响出现两次以上升降过程,分蘖时间长,分蘖多而分散,成穗率、结实率低且变幅大,经济系数也低,不同品种(组合)间产量差异大,根系发达、抗旱力较强的品种(组合)产量较高。 覆盖地膜使土壤耕层增温保湿,促进旱作稻提早出苗,出苗率提高,生长加快,生育期缩短,产量提高10％以上,高者增产近50％。
The results showed that the cultivation of dryland rice in yellow soil dry land and Wangtiantian in the middle part of our province was better because of the better water retention and antistatical power in Wangtian field. The emergence and dryness of drought-resistant rice were 4 ~ 5 days earlier and the whole growth period shortened by 5 ~ 7 days , Strong grain filling is also better than dry land, so the yield is generally higher than the dry land. Whether in dry land or in Tiantian field, the dry-crop rice experienced more than two months from sowing to emergence, its tiller growth and decline were affected by rainfall distribution more than two times, the tillering time was longer, tillering was more and dispersed, the percentage of ear to ear and seed setting was low And the large amplitude, economic coefficient is also low, yield differences between different varieties (combinations), developed roots, drought-resistant varieties (combinations) higher yield. Covering the plastic film makes the soil temperature warming and soil moisture, promote early emergence of dry rice, emergence rate increased, growth accelerated, shortened growth period, the yield increased by 10%, the highest yield nearly 50%.