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首页> 外文期刊>Pakistan journal of botany >Nitrogen fixation of legumes and yield of wheat under legumes-wheat rotation in Pothwar
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Nitrogen fixation of legumes and yield of wheat under legumes-wheat rotation in Pothwar

机译：Pothwar中豆类-小麦轮作条件下豆类固氮和小麦产量

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Legumes build soil fertility and contribute substantial amounts of N for sustainability of cereal based cropping systems. These lacking information for the system as a whole in rainfed pothwar were investigated through field experiments at two different locations i.e. (Research farm of University of Arid Agriculture Rawalpindi, UAAR and farmer's fields in Chakwal district). Mung bean (Var. NM-92) and mash bean (Var. Mash-3) were rotated with wheat (Var. Wafaq 2001) with the objectives to assess N2-fixation of these legumes and study their residual effects on soil NO3-N and subsequent wheat yield. Sorghum (Var. YSS-98) was also grown as non-legume reference crop. Mash bean not fertilized with P produced 4.27 t ha-1of dry matter compared with 4.38 t ha-1 when fertilized with P @ 80 kg ha-1. Similarly, mash bean fertilized with P yielded 4% more grain followed by mung bean and response of P fertilizer was 13%. Legumes N2-fixed ranged from 13-80 and 18-38 kg ha-1at UAAR and Chakwal site, respectively. The NO3-N contents in the soil under non-legume sorghum were less compared with legumes. Maximum contents of total NO3-N, 58 kg ha-1in soil profile was observed under mash bean fertilized with P. Additional residual soil NO3-N under legumes relative to adjacent sorghum crop were 22 kg ha-1at UAAR site, 83 % higher when compared to Chakwal site. Both legumes with and with out P fertilization increased the biomass and grain yield of succeeding wheat with an increase of 18% over non-legume sorghum. Legumes-cereal sequence improved NO3-N status of soil as well as yield of subsequent wheat.
机译：豆科植物增强了土壤肥力，并为基于谷物的种植系统的可持续性贡献了大量的氮。通过在两个不同的地点（即UAAR的干旱农业大学Rawalpindi的研究农场和Chakwal区的农民田间）进行田间试验，调查了在整个雨养pothwar中整个系统缺乏的信息。绿豆（Var。NM-92）和豆（Var。Mash-3）与小麦一起轮换（Var。Wafaq 2001），目的是评估这些豆类对氮的固定，并研究其对土壤NO3-N的残留影响以及随后的小麦单产。高粱（品种YSS-98）也被种植为非豆类参考作物。未施磷的菜豆干物质产量为4.27 t ha-1，而施以80千克ha-1的磷施肥时为4.38 t ha-1。同样，施以磷肥的豆的谷物产量要高出4％，其次是绿豆，而磷肥的响应率为13％。在UAAR和Chakwal站点，豆科植物N2固定的范围分别为13-80和18-38 kg ha-1。与非豆科植物相比，非豆科植物高粱土壤中的NO3-N含量要低。在施用磷肥的豆下，土壤剖面中NO3-N的最大含量为58 kg ha-1。相对于相邻的高粱作物，豆类下豆科植物下的残留NO3-N残留量为22 kg ha-1，而UAAR处为83％。与Chakwal网站相比。施用磷肥和不施用磷肥的豆类均增加了后代小麦的生物量和籽粒产量，比非豆类高粱提高了18％。豆科植物-谷物序列改善了土壤的NO3-N状况以及后续小麦的产量。

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