Effect of cross planting density on peanut population growth and yield
In order to establish a high-yield model with reasonable planting density under cross planting mode,the effects of planting density on agronomic characteristics,group structure changes and yield were studied with semi-trailing type peanut variety Fuyu Silihong and erect type Jihua 17 as materials.Planting densities were set in 6 modes,M1(2.385×105 plants/hm2),M2(2.084×105 plants/hm2),M3(1.852×105 plants/hm2),M4(1.666×105plants/hm2),M5(1.389×105 plants/hm2),M6(1.191×105plants/hm2).Double grain seeding(2.385×105plants/hm2)was used as control(CK).Plant traits,SPAD,dry matter accumulation and yield traits of individual peanut vari-eties under different planting density were measured.With the decrease of planting density,the main stem height and side branch length of the two varieties gradually increased.The semi-trailing peanut variety Silihong had the highest main stem height and side branch length under M6 density.The erect peanut variety Jihua 17 increased first and then decreased with planting density,and the main stem height and side branch length were the highest under M5 density.With the decrease of planting density,the SPAD values of the two varieties in pod setting stage and har-vest stage tended to decline first and then rise.The accumulation of dry matter of single plants(aboveground and un-derground)of M4,M5 and M6 during the harvest stage of Silihong were significantly higher than that of CK,that of Jihua 17 at M4 had increased significantly compared with CK,had increased by 155.35%and 23.31%respectively compared with control in harvest.In addition,with the decrease of density,Silihong yield increased first and then decreased,pods per plant,100-pod weight and pod yield per plant were all on the rise and then declined,and kilo-gram pods count was lower than that of CK.The yield of Jihua 17 was decreased,number of pods per plant and pod yield per plant showed an upward trend,and kilogram pods count was less than CK.In summary,cross plant+sin-gle-seed planting mode could increase peanut height,SPAD and dry matter accumulation,and subsequently in-crease yield.Under cross planting,the appropriate sowing density should be selected according to peanut type,M4 density for semi-trailing type might be the best,and M2 density for erect type might be the best.
peanutcross planting patternsingle seed fine sowingdensityupright typesemi-trailing type
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