Effects of nitrogen application with straw deep-buried on maize root system and yield in salinized farmland
To explored the effects of different nitrogen application levels on the root morphology and maize yield under straw deep burial in salinized arable land,a 2-year field experiment was carried out in Hetao Irrigation District.The experiment included five treatments:CK(control group),N0(no nitrogen application),N1(135 kg·hm-2),N2(180 kg·hm-2),and N3(225 kg·hm-2).Maize root samples were collected at jointing stage,silking stage and maturity stage.The results showed that under the condition of straw deep burial,in the whole growth period,compared with the treatment without nitrogen application(N0),the total root length,root surface area and root volume increased by 67.65%,86.71%and 62.95%,respectively.The average root dry weight was increased by 94.63%and the average root shoot was increased by 16.43%.Although the overapplication of nitrogen(N3)promoted the root system in the 40-60 cm soil layer,it still inhibited the root system in general.Compared with N2 treatment,the total root length,root surface area and root volume of the growth period were reduced by 12.45%,17.48%and 18.07%,respectively.The average root dry weight was reduced by 11.68%and the average root shoot ratio was reduced by 8.22%in the two years of N3 treatment.Compared with the control treatment,the 2-year average yield of N2 treatment was increased by 4.96%.The optimal nitrogen application level for maize in Hetao Irrigation District was 180 kg·hm-2.The results can provide a theoretical basis for optimizing the nitrogen application level of maize tillage and improving the utilization of straw resources in salinized arable land.
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