Through experiment on the productive levels of several cultivated forages in high yielding period,perennial forages selected to be suitable to grow in the high fertility and water conditions in Hexi region were Silphium perfoliatum、Medicago sativa、Lotus corniculatus、Bromus inermis,hay yield reached 30 120,21 179,20 679 and 25 024 kg/hm~2 seperately;
It was shown that the maximal plant biomass on mountain slopes was achieved at the application norm: N 78.06 kg/ha and P 2O 5 61.15 kg/ha, while the maximal hay yield was obtained at the norm: N 76.65 kg/ha plus P 2O 5 57.29 kg/ha.
The green forage yield of two-time-clipping was the highest reaching 96.80 t/hm~2. Clipping only once ascended the hay yield to 35.04 t/hm~2, topping all.
2. Experimental groups have fresh grass and hay yield increased compared to CK, B2 fresh grass and hay yield is the highest, respectively is 293. 84 t/hm~2 and 40. 52 t/hm~2, A2 fresh grass and hay yield is next, B2 is remarkable (P < 0.05) to be higher than B1, A1 and NO.
among the forages of the grass family, fresh and dry yield of every experimented variety could respectively reach 68～79 t/hm2,13～20 t/hm2,the fresh yield of forage2-china was the highest, reached 78.46 t/hm2, the dry yield of Lph 1407 was the highest,reached 19.39 t/hm2;
dry yield difference was great for all varieties,the highest for 3 year's average yield was Meibiao 403+Z,being 13 594.7 kg/hm~2,increasing yield by 49.8 percent above Superapolo whose average yield was the lowest,the difference was significant.
Results show that dry yield of "Zhaodong" is higher than that of "Zhunger" and "CW200", and net photosynthetic rate and water use efficiency of "Zhaodong" and "Zhunger" are higher than those of "CW200".
As the results, the height of Kobresia, the dominant species on the Qinghai south plateau, was decreased by 3 cm in the late 1980s. The development percentage of florescence and seed maturity of herbage by 20%～50% and greenness and dry yield of grassland declined by 70%～80%.
该区的气候变化使青南高原主要优势牧草——嵩草的生长高度由80 年代末期的6～8 cm 下降到现在的3～5cm ,牧草开花期和籽粒成熟期的发育百分率普遍下降25% ～50% ,发育程度一般达不到50% ,天然草地产鲜草量和干草产量减少约为70% ～80% 。
Genetic architecture underlying rice biomass yield and its two component traits (straw yield and grain yield) were analyzed for a population of 125 DH lines from an inter-subspecific cross of IR64/Azucena.
The average air-dry yield are more well for Brachiaria hybrida, Panicum maximum Jacq. CIAT T58 and Panicum maximum Jacq. CIAT 6901. The yield were 28 480 kg/hm2, 25 515.5 kg/hm2 and 24 308.5 kg/hm-respectively, Brachiaria hybrida were increased by 56.5%.
Early spring grazing (GHH and GHG) reduced spring hay yield; quality, however, as indicated by crude protein, acid-detergent fiber, and in vitro dry matter disappearance, was higher than for hay not grazed in spring (HH and HG).
The trend of change in soil TOC and LFOC was similar to hay yield and C removal in hay, which suggests that increasing hay yield with N application concurrently also increases soil organic C.
In contrast to the exogenous strain, the local strain gave a significant increase in nodule number and shoot dry yield in all the experimental fields for the three cultivars used.
干草产量
hay yield
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